I live on the West Coast, in California, so I can't really help you like a local can. But Yelp is a good starting point for getting a feel for new places (food, restaurants, etc.). If you want to do some second-hand shopping, look for thrift stores (I recommend Goodwills and SPCA thrift stores; they tend to have pretty good items for not too expensive, and the money goes to good causes) or second-hand consignment stores. Typically avoid the big tourist shopping places if you're going economical, since they're designed to get the most money out of you.
Also, be really, REALLY careful during nights and evenings. If you're going someplace when it's getting/is dark out, stay in well-lit areas where there are plenty of other people around. It's better to be safe than sorry, and the last thing you want is to get hurt when you're supposed to be having fun.
I hope you have a great time, and I apologize in advance for any idiots who happen to live here. ^^;