Go to the Aloha Swap Meet to get all your souvenirs.  There is a lot of inventory to pick from and you can spend all day going all around the whole stadium if you are a shopaholic.  It is located at the Aloha Bowl and open on Wednesday, Saturday and Sunday.  If you have too many items to take home, buy another small suitcase to take them back with you.

There's no charge to hike, snorkel, surf or drive around the island.