I can't wait for a tropical pack. I hope that they don't forget jet skis, water skiing, and surfing. I also want boats. I don't care if they can only traverse a neighborhood. Create neighborhoods that are mostly beaches and ocean and fill them with water-based activities.
If we can watch a steamboat go by, I would love it if an area even half that size could be used for real boats! I would also love to be able to take smaller boats through the waterways that run throughout neighborhoods. Larger boats would, of course, be reserved for oceans and large lakes. Fishing from the boats would be cool, too.