Port of Tampa: stayed at the Embassy Suites downtown. Rented from Thrifty--they gave us a ride to and from the cruise terminal.
We took our own water and soda... and there were many jealous people in the port terminal. Next time I'd use a little travel cart and not have to carry it.
Grand cayman: Stingray City: booked through Nativeway. Tour was a little different than expected but the water was beautiful. Tour was $60 pp.