Theres a beach on Oahu on the north shore where dolpnins swim constantly. its a lagoon lype of beach with access for entrance and exits that the dolphins take advantage of. it wasnt made specifically for them, they just got accustom to it. when people go kayaking or surfing they swim rigtht up to you. i went there once, it was very cool. scary at first cause its a dark shadow with a fin even though you know its a dolphin, i think back to jaws 3. they move through the water like nothing. going into any angle on a dime. there is no way a shark could catch them. theyve been known to pester sharks actually. you can touch them alot when there next to you.