My business partner and his wife just got back from CTI last month. He informed me that scuba diving and other activities were booked solid 3 weeks out by the time they arrived. Is this normal? Should I call CSA and book dinner reservations and activities in advance?

My fiancé and I are the outdoor activity types and will absolutely want to scuba, sail, ect. while on our vacation.

We will be at CSA 9/9/13 - 9/16/13