Well, I'm biased, thinking that San Diego is one of the nicest cities in the country - if not THE nicest. Not knowing if you're going to have much daytime free-time, or if you're on the prowl, here's some places you'd want to check out:
- Gaslamp quarter (downtown 4th Ave. - 7th Ave. south of Broadway) for nightlife. Lots of great restaurants and clubs.
- Kansas City Barbecue - walking distance from the Hyatt. Where they filmed the bar scenes for Top Gun.
- Pacific Beach for restaurants and clubs.
- San Diego Zoo. Probably the best in the world.
- Sea World. Sounds hokey, but it's a blast (even for a 47 year-old like me.)
- Balboa Park - Aerospace museum, and automotive museum.
- Point Loma - Cabrillo Nat'l Monument
Re: Tijuana. There's little you'd want there that you can't get in San Diego for a few dollars more, and the risk to life and freedom just ain't worth it.