What's the name of the taxi service and did you book them in advance?
I don't recall the name of the service - might have been Super Shuttle. I just found them at the airport, had not made prior arrangements.
Sorry, we had friends picking us up at the airport, so didn't take taxi to and from the airport. But its not very far, so the pice should not be that huge. I do know there's a free downtown circulator that will take you anywhere around downtown Tampa, so check with the concierge at the Marriott and they'all be able to help. Have a good trip!
Airport to Marriott:
$24 with regular taxi service
$12 using Uber.
No advance reservation
You don't have to worry about taxis they roll in all the time. As you walk out the doors the guys will call a legitimate cab for you checking where you want to go and what price. I never had a problem either shopping or to the airport.
Get an answer from Tampa Marriott Waterside Hotel & Marina staff and past guests.