My husband and I are planning on spending Saturday at the zoo, and figure on a late lunch/early dinner scenario for our meal out. Any good recommendations? We'll be fairly casually dressed since we're walking all over the Zoo all morning, and are looking to spend no more than about $10-20 per entree (cuisine isn't a huge issue, we like everything...). We're also Metro-ing it into the city, so we'll need to find something within walking distance. Thanks!