I spent a five days in early August, traveling solo, at the Renaissance St. Croix, and couldn't have been happier with my decision to stay at the resort. I've read dozens of reviews on Trip Advisor and to some extent agree with them all, but will share my experience
Upon checking-in, I was taken to building 5 on the east side of the property and stayed in a lower-level unit. The room was clean and well-maintained, the bed large and comfortable, the washroom well-appointed. Like all units, there was a large screened-in porch in close proximity to the beautiful bay. The room was air-conditioned, but also exposed to the elements via wood slats on the doors and windows... I found the temperature perfectly balanced: I was never uncomfortable, but also never felt like I was on the fifteenth floor of a concrete ecosystem - I felt like part of the island (one night I actually found a crab trying to fight through the door slats... if this sounds scary instead of charming, the resort may not be for you).
From reading earlier reviews, I was hyper-aware of possible maintenance problems, but had to search for them in my unit. One corner of the bathroom door was somewhat worn, the couch may have seen better days, the ceiling fan on the porch as well as the screen itself could use some repair - but the resort has one foot in a rain forest and the other on a beach, and I can only imagine the constant maintenance required. If you are looking for perfection, you'll need to leave the room, walk a hundred feet, and sit on the beach... if you want a comfortable retreat, it is wonderful.
The beach is amazing, picturesque - there's not much more to say than that. The east side is rocky and great for photos (the waves were impressive!); the west side - soft sand, crystal clear water, and some reef outcroppings for scuba and snorkeling. The pool itself was pretty standard, but very well-maintained with fantastic lounge furniture... I found myself spending more and more time at the pool because of that (How often is that noteworthy? It's seriously great.)
The dining options were very limited because of the low season - it was basically breakfast, then lunch and dinner at the pool bar. I was initially disappointed with the lack of options, but it ended up motivating me to go off-property, which was good for me. I was actually exploring the island most days during breakfast hours, but did have lunch each day at the Flamboyant Bar. The food was very good - I tried all the sandwiches (fries are great too) - but need to give special mention to the bartender Mark, who was around for three of my five meals. He was phenomenal, and sincerely wanted me to make the most of my trip, which was so appreciated. He gave suggestions for recreation, dinner plans - he was totally engaged, professional, and seemed genuinely happy to see me when I strolled up from the beach, which is a great feeling on a solo vacation. If he's working when you visit, chat him up - he has a lot to offer about the island, and makes a mean Painkiller.
So this is obviously a very subjective review, based on my own time on a very uncrowded resort, but I couldn't recommend it highly enough if you want to have a comfortable hotel with a great beach that is very accessible to the rest of the island.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.