Hello Dominique and welcome! Many parks offer specials on they website for advanced bookings, particularly Xcaret and Xplor. However, booking through your resort usually means that the transportation is included so may be worth the little extra. Chichen Itza is most often sold as a set tour including a visit to Valladolid and a cenote as is usually about $50 USD per person. I've heard good things about the Dolphinaris and their treatment of dolphins. And for the Coco Bongo trip, I recommend getting the VIP pass in order to have a table to sit at and table service! Make sure you do not book any tours for the day after Coco Bongo!!! Happy Planning! Sofia Lori's Office Assistant