When in Clearwater, check out the Calypso Queen, a 65-foot triple decked cruise ship, specifically designed for the intra-coastal waterways. They offer lunch and dinner cruises, as well as just plain casual sightseeing.
The Caribbean-themed ship, capable of carrying 149 passengers, has two fully enclosed decks with air-conditioning and a third level is an open-air deck providing beautiful views. The vessel is complete with restrooms on both decks, two full service bars, full service galley and state of the art sound system.
The Calypso Queen is located at Clearwater Municipal Marina, 25 Causeway Blvd, Slip #18. It's kind of difficult to manuever around the confusing loop - especially if you're not familiar with the area - and even harder to find a place to park once you do get there. I suggest you do as we always do, park far away and make the journey on foot. You need the exercise anyway, and it'll make you appreciate those big colorful cocktails they serve when you get there. (I'll have three blue ones, please.) Pay for your tickets at the big blue building across the lot, not at the boat itself.
Other fun activities nearby include the smaller Little Toot dolphin-sighting tour boat, Chute-em-up Parasailing, and of course, the glorious Pier 60.