My 8 year old son would like to swim in a natural pool under a waterfall. Where would you suggest we go for this? We are staying in Kaanapali and have a car to get arround the island. We don't want to go all the way to Hana since there will be 5 of us including a 1 year old. We are going to be on Maui April 6 to 14 . So excited!