We'll be visiting the Big Island in mid-August with our 13 yr. old granddaughter. Here are some of the activities we've planned. Let me know if you have other suggestions. We'll be staying near Kona the first week and then 3 days near Waikoloa Beach (probably a condo near the Hilton).
2.Swim/snorkel with the manta rays
3.Black sand beach, VNP, Akaka Falls & Waipio Valley (probably do in one long day--maybe too long a day?)
4.Swim with dolphins at Hilton
6.Swimming, snorkeling & bogey boarding at various spots
We've been to the B.I. many times but not with a 13 yr. old. :-) She's been to Maui but not the B.I.