Solo traveling for 21st birthday

I am planning a solo trip for my 21st birthday next year, and I have a few ideas in mind. I have about $2000 total

My first choice is mostly SoCal and Las Vegas. I would do Los Angeles, Vegas, and San Diego. In LA, I would do things like Universal, Hollywood Blvd., Rodeo Drive, and generally all the things there are to see in Los Angeles. In terms of Vegas, I would stick to minor gambling . And yes, I would also be drinking . I did go to Vegas about 2 years ago, but I wasn’t able to do as much since I was under 21 at the time, and all the good stuff was available for 21+. I would also go to the San Diego Zoo, do stuff like downtown, and maybe cross the border into Mexico .

My second choice would be South Florida . I have been to Miami, but only for a few days and I would really like to see some of the nightclubs and the nightlife in Miami. I would also like to go see some of the national parks and Key West. This trip would be about 5 or 6 days.

I would very much prefer to stay in the country, since flying out of the country would be incredibly expensive .

If anyone has any suggestions, they would be much appreciated.

Solo traveling for 21st birthday