I am thinking of heading down March 15th (to Gran Club). Although there are limited sites online that have dive info for Santa Lucia, I see that there is shark diving. Has anyone done this before? Is it required to pre-book? Are the sharks around all year? What are the other dive sites like, and what are the prices for diving in the area? Any info would be appreciated, thanks! I've been to Jibacoa for the past two years but I would like to experience some new dive sites this year.