Getting to my interview weekend was an absolute pain! It was the very first time a flight was canceled on me, let alone the day of having to be at the program. I had to improvise at 5am, when I'm not a morning person, to get there. I had traveled for over twelve hours, though I really just needed to go the next state over! It would've been easier if I had a car, but I don't. To top it off, the hotel that the program has prospectives stay messed up on the rooms, so I ended up sleeping on the couch the first night.
But in the end, it was worth the pain. I like the program and the official day of interviews went well. I was even able to impressed a rather stern professor that has a reputation of making prospectives cry with my knowledge, even though his area isn't a part of my interests!
The point I'm trying to make is that I could've made that whole experience bitter but I turned it into a learning experience to improve upon myself. In my case, it was tolerance of the unexpected.
Follow the advice of preparing well for your interviews, so you won't have any excuses other than fit. Also, when most talk of fit, they don't just mean with the lab. They also mean with the entire department style too.
Good luck and I wish you well!