You actually order the Faster to the Fun program online via Manage My Bookings in the same place you book shore excursions. So you would search for excursions for Tampa (in the Paradise's case). The nice thing is the $49.95 covers everyone in your booking, so if you are a family it is definately worth the expense.
It is basically the equivalent of having VIP status. So if you are above Gold status or booked a Suite, you don't need this program.
The other nice thing is your stateroom is guaranteed to be ready when you board. That is why I purchased. Past cruises have been a pain in the rear having to tote the carry on luggage all around the ship for 2-3 hours. Your checked luggage is also given priority status and should get to the room quickly.
I cruise 4/29/2013 and this will be my first time using Faster to the Fun, so hopefully it was worth the purchase!
Carnival Tropical February 2000
Carnival Glory October 2003
Mos@ic Mariner of the Sea @ddicts invasion cruise October 2005
Carnival Fascination August 2011
Carnival Pride April 2012
Carnival Dream September 2012
Carnival Paradise April 2013