I hiked to Carmbola Tide Pools while a guest at the Renaissance St Croix, and after some initial struggles, had a fantastic time.
The hike itself isn't bad, but finding the trail head can be tricky. By "can be tricky," I mean "I walked twenty minutes straight uphill to the mountain ridge before realizing I was in the wrong place."
Here's my traveler's tip: Turn left just before the guardpost and find a place to park. Walk up the road until you come to a Y with a rocky cul de sac to your left and a brush-covered path to the right. Continue to the right for a couple yards and you'll end up back on a semi-paved wide pathway. Walk up this for maybe a hundred feet, keeping your eyes to the right, and you should see a dirt embankment with a little wooden sign about twenty feet up pointing left. I'm attaching pictures to this review. Go to the sign and follow the path. If you don't see it, if you keep walking up the small paved road... when you're winded, turn around and start again from the brush. It won't take long.
The path is an adventure - it's narrow and a little claustrophobic at times, but not difficult. And it's well-maintained enough that once you find it, it's self explanatory. Towards the end, you'll come to an open area with long grass... contrary to instinct, you'll be correct to go to the left (south, away from the coast - the way the trail seems to lead) but will follow a curved path down to a dirt road. Go right here and it will take you to the beach.
From the beach, you'll want to head left to the tide pools. Yes, you will need to do some light bouldering, and there are some miraculous tiny black crabs that match the volcanic rock and will try to terrify you. But inside the haven is heaven.
I was there at low tide and missed some of the wave "fireworks," but snorkeling was great and it felt very wild and isolated - just the treasure I was looking for after a long hike.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.