As for staying clear of the area completely, I personally don't think you have to exercise that much caution. Oakland is home to a variety of things to see and things to do. Here are is hastily put together list:
- Oakland Museum (admission is free on the first Sunday of every month)
- Oakland Zoo (for animal lovers)
- Oakland Chinatown (super cheap groceries, authentic Chinese restaurants, and bakeries with delicious pastries)
- Lake Chabot (it's huge and it's perfect for hiking)
- Lake Chabot Golf Course (they offer golf lessons)
- Lake Merrit (you can visit the boat house and rent a kayak for 2 people or a pedal boat for 3 people for some fun exercise on the lake)
- Oracle Arena & Oakland Coliseum (people come here to watch the Oakland A's, Golden State Warriors, and Oakland Raiders. Off the top of my head, I also remember that Rihanna performed here in 2011 and that Alicia Keys is coming here next week on March 10th.)
- There are also tons of really great and highly recommended restaurants in Oakland, but you'll have to check Yelp for that information.
Again, I want to say that you should always be careful and be smart, wherever you are. Go with a group, don't flaunt your wealth (leave valuables at home), and don't stumble around looking like you're a lost tourist (plan and search for directions before heading out).