Family is heading to the Big Island in September. Kids are 12 and 9. We will be on the Big Island for 8 days. We want to do a Luau, horseback riding, day snorkeling, and a night snorkel with manta rays. We are staying at in the Hilton village in one of the 2 bedroom lodging time share spots. We will have a 4x4 Jeep rented and want to go up to Mauna Kea. I know lots of things just depend on weather but should I start prebooking some things for early in our trip? If so, what companies and places to you recommend?