Most of the Chinese restaurants in the areas you requested have buffets for either lunch or dinner or both. They all advertise in the Yellow Pages; which you can look through at your hotel.
The ones in Tampa:
China Star/6507 W. Waters Avenue/Tampa (813)889-8898
*Serves lunch/dinner buffets All meals prepared without MSG
Just off the new Veteran's Expressway Moderately priced
Tung-Tung Restaurant/2807 E. Busch Blvd./Tampa (813)935-7651
Close to the Busch Gardens amusement park
Mai King Restaurant/8503 W. Hillsborough Avenue/Tampa (813)885-4125
Close to the airport.
There are lots of Chinese restaurants in Florida, unlike where I moved to, Atlanta. You should have no problems finding any.
Best of luck.Tampa, FL