I_mix

I'm loving that there are multiple threads about reading on here right now that are pretty active. The Read Harder Challenge is a great suggestion from another thread. WBUR has a great post about reading books that aren't written by white male authors. You can also check out NPR's Book Concierge if you need recommendations. 
I'm currently reading Raising Steam by Terry Pratchett and The Man Who Fell From the Sky by Walter Tevis.

There isn't just one correct way to do things, and at the end of the day you should only list things that you are comfortable having on your CV. It sounds to me like you got some very good advice, and I'm sorry if some if it was conveyed in a way you found offensive. Keeping a high GPA while working to support yourself is more telling about your character and abilities as a student than if you'd kept your high grades without also working, so I understand that advice. That said, it might also simply be something that you mention briefly in your SOP or some "do you have anything else to tell us" section of the application, if you are so inclined, and there is no harm in leaving this out if you don't want it on there. You can also choose to only mention some jobs but not others -- you are not obligated to mention them all. Same goes for the volunteer bit (which is fine to have, I think), and the travel bit, and that one I would be much more inclined to not mention at all because it's less obvious what it would teach the adcom that is relevant to their decision. An "interests" section is an odd one to have on an academic CV, in my opinion.
Overall your goal with the CV is to present yourself the best way you can, but it's also perfectly fine if your CV is quite short for an undergrad who is just applying for a Masters now. "Padding" won't do you much good, so instead the question to ask yourself about each potential entry is whether it presents an aspect of yourself that you want the adcom to know, and whether it supports you application or might help the adcom reach a positive decision in your case. That decision is up to you, so just do whatever feel right. If something doesn't help or you just don't want it there, then keep it out.

If you're enjoying 1984 and are still feeling dystopian-ey, Brave New World is the way to go, like IoneMacaroni said. I remember thinking it was a lot closer to where I felt the world was going when I read it, kind of scary. As far as dystopias go, Ray Bradbury's Fahrenheit 451 would be my favorite, I think. 
As for classics, don't know if Moby Dick can stand up to Gilgamesh if being a classic is about age, but I would definitely recommend it.

Entertainment purposes/ just overall great reads too?
Of what I've read recently, I REALLY recommend Han Kang's The Vegetarian and Hanya Yanagihara's A Little Life. Also, if you haven't read some of Haruki Murakami's works before, Kafka on the Shore is my favorite, followed by Norwegian Wood. I also recommend The Tin Drum by Gunter Gras and Franz Kafka's The Castle (if you like Kafka).
EDIT: Sorry. Not all of these are classics. The latter two are definitely what I would consider "modern classics". The first three are just recent lit that I really enjoyed.

Hi, would anyone like to review my SOP? I would read yours as well. Any help would be appreciated.

Think about it from their perspective. Your LOR writer is an extremely busy person. They have many responsibilities to balance on a day-to-day basis, and one of those responsibilities now includes writing your letter. They are well aware that the deadline is approaching, but probably needed a break. The holidays are a fantastic excuse to relax and take a step back from work, even if for a day. They still have 5 more days to submit your letter. They may have said they would do it by today, but chances are that things got in the way. Since the actual deadline is on the 5th, they'll be sure to respect it.
Is it a problem that you emailed today? No, because an email can be addressed once they feel like returning to work and checking their emails. Just be sure to cut them some slack. Even using a previous letter needs to be altered for the specific program you are applying for. So if it takes 15 minutes to change the letter for a specific program, and you applied to a large number, that is a few hours to submit them all. 
You can start to be more adamant after the holidays are done. For now, let your LOR writer enjoy what is probably one of the few times during the year that he or she can relax. 

Is it a problem? No. Was it effective? Most likely, no. It's new year's eve and a weekend. Even professors deserve some time off. There's still time before the deadline and since this won't be a time-consuming task, they may well do it at the last minute (stressful as it may be for you). 

Personally, mine was flocculent: Resembling tuffs of wool in loose, fluffy organization. 

There's some excellent suggestions already given but I'd throw in yoga really helps my mind switch off and to destress from the day. It might take a while to learn to empty your head but I find giving myself 45 minutes at some point during the day to stretch and be mindful and only in the present really helps. Exercise in general is wonderful, but not always possible - e.g. if you're injured. I agree that reading is great but I find my mind drifts a lot when watching TV. You know you best. If you're on a hike and find your mind starts drifting, bring it back to the present. Focus on the colour of the leaves, or the rhythm of your breath or the noise of the insects or something. Acknowledge the thoughts that pop into your head but say to them "this is not the time for you to occupy my head. This is me time." and return to focusing on the thing in the present. 
If you can get some social interaction, that's wonderful but sometimes you can just end up talking about research. So if you hang out, maybe allocate 20 mins for research venting then make it an off-limits conversation. 
Just a few suggestions that I've found really helpful. Hopefully there's something on this thread that works for you

I ride my bike very fast until the only think I can think about is how much it hurts to ride my bike very fast. After that, I stop thinking and just enjoy the endorphines. 

Advice I received from a prof at Princeton is: those teachers are fine, but get a tenured prof to endorse their letter. 

Yeah, that will make the letters less impactful. Someone who doesn't have a PhD can't really speak to someone else's ability to complete such a program, and won't have (m)any students to compare you to. They often won't have a track record of placing students in graduate programs who go on to be successful. This means that adcoms won't be able to rely on the opinion of the writer as much as they would in the case of letters from more experienced folks. But if this is the best option you have and it'll be a detailed letter from someone who knows you well talking about aspects that other people might not touch on, and you have two other letters from more experienced professors, you should be ok. 

It sounds like (2) is the stronger letter. I would choose that. There will be ways of discussing your long-standing interest in your field, for example by discussing this undergraduate project in your SOP.