We had no problem scheduling both the Dolphin Cruise and the Beach Combing. We called first thing when we got there and arranged the Dolphin Cruise -- we got our pick of when we wanted to do it. From what I understood, the Dolphin Cruise is done throughout the day. We scheduled the Beach Combing with 2 days notice -- I believe that's only done at low tide so there's a chance to find shells. If you do the Beach Combing, here's a hint to try and find sand dollars -- don't look where the water meets the sand -- check out the area where high tide was. The ones we found in the surf were alive and had to be tossed back but the ones up higher on the beach were not. We had two wonderful experiences -- I hope you do too. Enjoy.