We rented snorkle equipment on our first cruise on the Triumph (since then we have purchased our own) ....I think it is available to rent on all Carnival ships. (if not, I've found that most ports rent it) Be careful though...the mask we rented on the Triumph was broken, and we didn't realize this until we got to Grand Cayman and were ready to snorkel....so, if you rent equipment, make sure to check it out first!! I don't remember the cost, but it wasn't too bad...and you can rent it for the day or for the week. You might be better off buying your own equipment though....that is what we did last year...at this time of year you can probably get some great deals on snorkel gear!!!
We had the same gear. Mine was broke too..never got to snarkle at all . didn't get a refund either....They said check it first before you leave the desk. Mouth piece was broke..........................This is our 3rd cruise coming up on the 23rd.........[Triumph] Jim in Missouri