There's plenty of shopping right near where you tender to. There's also a dive shop, Abanks, that used to let you use their ladder to go snorkeling near the tender spot. Grand Cayman is a clean island, pretty flat, lots of money there, but no real tourist attractions. A lot of people go to Hell so they can mail a postcard and get souvineers, but to me(just my opinion) it wasn't worth the cab fare.
Bon Voyage