The activities are HHI are fantastic for kids. We were there last June with our 4, 7 and 22mo old and had a blast. Every afternoon the baby would take a nap and DH and I switched off taking the big kids to the pier to catch crabs, and we also spent a lot of time doing the crafts and games at the Community Hall.
The atmosphere at HHI is so great for families, the pool is a blast and the CMs are awesome. A lot of camp type activities, themed pool parties, games, crafts, campfire and songs, tons more but that is what I can remember my kids enjoying the most.
We will be there again next Summer and plan to rent bikes for the week!