This is one of the very few caves you can explore (partially) independently in Belize. The entrance fee is a mere $5 USD & that includes the entrance fee to St. Herman's Blue Hole (which is a hike, or short drive down the road at a separate parking lot).
The park employee recommended we take the lowland hike TO the cave & the highland route RETURNING for great views. He was right. The bugs on the trails swarm, so strong bug repellent is a must as well as water. Some caves stay relatively cool, this one did not.
St. Herman's cave has a scenic opening & I went during dry season, so I'm curious to see how high the river is during wet season. Still, there was a small river nonetheless. Without a guide (must be arranged in advance), visitors are permitted about 100 yards into the cave. Path is well-marked with reflectors and relatively easy. I've seen other caves (in other countries & in Belize) so this was just average, but for my partner (was his first time) he was much more in awe. It's a smaller cave with only one walking path so it was ideal for us to be the only ones there.
Afterward, we wanted to hike (outside) the the OTHER entrance of St. Herman's cave -- which is accessible but further away. However, we had little water/snacks so thought we should pass. NO REFRESHMENTS ARE SOLD HERE OR AT THE OTHER ENTRANCE SO COME PREPARED. Flashlights are available for hire.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.