We are heading to Maui in August and after reading this board, we have chosen to do the Old Lahaina Luau and Trilogy Discover Lanai Sunset Sail. We are also considering the sunrise bike tour but I'm not thrilled about digging out warm clothes to pack for our trip to Hawaii!! Just how cold does it get up there in August?? Is a sweatshirt enough or do we need long pants and ski jackets??