Dolphin Landings Charter Boat Center (4737 Gulf Blvd., St. Pete Beach, 33706. 727/360-7411) has daily four-hour cruises to unspoiled Egmont Key at the mouth of Tampa Bay.
Aboard the glass-bottom boats of St. Nicholas Boat Line (693 Dodecanese Blvd., Tarpon Springs, 34689. 727/942-6425), you take a sightseeing cruise of Tarpon Springs' historic sponge docks and see a diver at work.
On Captain Memo's Pirate Cruise (Clearwater Beach Marina, Clearwater Beach, 33767. 727/446-2587), crew members dressed as pirates take you on sightseeing and sunset cruises in a replica of a 19th-century sailing ship. The Starlite Princess (Clearwater Beach Marina, at the end of Rte. 60, Clearwater Beach, 33767. www.starlitecruises.com) , an old-fashioned paddle wheeler, and Starlite Majesty, a sleek yacht-style vessel, make sightseeing and dinner cruises.