I am super-excited to take my family of 4 (2 kids boy 8 & girl 16) to GC in about 3 weeks. We will stay 5 nights at the Ritz Carlton on Seven Mile Beach. I am looking for recommendations on activities to plan our days. We are not divers so that is out. We like Snorkeling and love hanging around by the beach. I want to make sure kids are not bored. Do I need to rent a car in GC to get around? I am hoping weather will be nice and sunny!