As an FYI, cab fare from WDW to TPA is $140 not including the tip. We did this once, luckily Continental paid for the cab fare. (they bumped us off our flight to MCO and sent us to TPA instead) We tipped the driver because we weren't sure he'd get taken care of otherwise, and at 3:00am, the likelihood of finding a fare from the BC back to Tampa was pretty slim...
Anne