We went today by boat, jumped off the back and swam up to the beach in front of Hell's gate. Glad we had a local guide to show us where to go in the cave and assure us bending and crouching would only be a short few moments and you would have enough space you won't feel claustrophobic. There is a inner pool that some people jump into but he said the water and time of day needs to be just right as it acts as a suction hole when the waves come in and will pull you out on the Atlantic side so you want to try that part only when the water is more calm. We watched crabs climbing up the walls and then moved on to scaling rocks in a natural staircase practically from so many users. Still a bit of a test of where to put the next foot and keep your balance but people of all ages were fine (no kids or elderly of course). From the top there was a great view and some holes to be avoided, but worth it - Carribean one one side and Atlantic on the other. The down "staircase" was a but trickier with a cheer or two when someone made it - but not hard. Try it - it is worth it. You'll be close to jumby bay so you may see sea turtles too.
If you own or manage Hell's Gate, register now for free tools to enhance your listing, attract new reviews, and respond to reviewers.