Most likely you will be put in the Center of the building rather then a wing unless you ask specifically for something different. If I am remembering my directions correctly you can be in the west end of the Dolphin and this puts you close to the grotto pool as well as the gym. If you are in the east end of the hotel you will be closer to the boardwalk, YC/BC. Its all a matter of personal preferance I have always stayed in the center area Lake view the view is good and the walk wont kill anyone (well it might but I pray it wont happen) check out glo's post in this forum, it is full of great info about the Dolphin. Have a great vacation and happy anniversary!!!
PS. everyone here has great Idea's so if you need more Ideas of fun things to do just ask. You will get your some great suggestions!