1) Rent a 4 wheel drive vehicle - something with a little ground clearance. You will find that there are some beaches where you can jump the curb and easily (and legally) drive up to a nice spot to hang out. Also handy for exploring remote reaches.
2) As much as you'll be in a hurry to relax and enjoy, bite the bullet for a few hours the first day and head straight for a local WALMART and gear up - prices are surprisingly as cheap as the the mainland, but they are fucking zoos out there. Get a cooler, bag chairs, beach blankets, flip flops, a few cases of bottled water, !maps! etc. Spend a couple of hundred bucks and have all the gear you like to roll with on board your island assault vehicle. By the way, they've got all the same cheesy T-shirts and post cards you'll see in the gift shops at 3x the price. Cuts down seriously on the logistics of finding shit when you're out exploring and relaxing.
3) Awesome sushi.
2) As much as you'll be in a hurry to relax and enjoy, bite the bullet for a few hours the first day and head straight for a local WALMART and gear up - prices are surprisingly as cheap as the the mainland, but they are fucking zoos out there. Get a cooler, bag chairs, beach blankets, flip flops, a few cases of bottled water, !maps! etc. Spend a couple of hundred bucks and have all the gear you like to roll with on board your island assault vehicle. By the way, they've got all the same cheesy T-shirts and post cards you'll see in the gift shops at 3x the price. Cuts down seriously on the logistics of finding shit when you're out exploring and relaxing.
3) Awesome sushi.