Take some sightseeing tours and you ll meet plenty of people and won t feel alone. I ve traveled solo for over 20 years and it s plenty of fun. Skip Disney because it s over-priced, over-crowded, and over-rated. I recommend visiting The Tampa Bay area, Ft. Lauderdale, Sarasota, or Ft. Myers. All have great attractions and beaches. You can do everything by yourself that you would with another person. You don t need anyone else to travel with to have a good time.
Traveling alone is awesome for meeting people! Go to see some concerts in Orlando or Miami. If you re in Miami, hit up some night clubs, go to the beach, para-sail. One night club tip, get on the guest list, or if you don t, find some girls in line, and ask them to escort you in with them (offer to buy them a drink or something once you re in). If you re really up for it, make the trip to the Keys.