Wish I could help more muchcat, but all I've done in Ocho Rios is a catamaran sail/snorkel (not much to see), Dunn's River Falls/Fern Valley, and a boat tour of the island. In Grand Cayman, we've done Stingray City, Seven Mile Beach, quite a few snorkels, and sub ride. I wouldn't get on a zip line, but have seen one on the travel channel in Jamaica that looked like fun, if you're not a whimp like me (too afraid of heights). The ATV Safari might be fun, too, Jamaica is a beautiful island. Just be sure to stay in a group there. I hope someone has been on some of the excursions you're interested in.
