The Kon Tiki in St Thomas was a good time. (I'm 37 and partied more in my youth). The beach where we moored for an hour was very pretty, but had no bathroom.
The host was very entertaining. My only complaint was that the steel band was amplified over a tinny p.a. system. I was right by the bullhorn. I had to go up to the top deck. Being in full sunlight was preferable to my ears ringing.
Rum punch was indeed unlimited, very sweet, and somewhat potent. It was not, as claimed by the host, made from 151 proof rum. I saw the bar hostess pouring from 80 proof bottles. Whatever! It allowed the host to make some good jokes.
NOW! In Barbados, the Jolly Roger party boat....that is a PARTY. Our dinner tablemates went on that and they said most folks got completely smashed and the crew's egging them on had a lot to do with it.
Have fun. Be careful.