Will be at CSA in 17 days and have a few questions.

1. Can I charge spa services to room or do I have to pay at the spa?
2. Scuba diving: what time are certified dives and how long do they last? Hubby plans to dive everyday and I am wondering if we'd be able to do the morning snorkel together.
3. Catamaran cruise: is rum punch the only drink they serve? How do you get off the boat for swimming in the caves? I hate jumping off a boat and would prefer a ladder to climb down. Do you tip on the cruise?

Thanks so much.