The parking area is 75-100 yards from the water, so be prepared for a bit of a hike. If you manage to get 27 feet, you are doing good. If you have a hood or head rag, wear it, as the sand suspended in the water at the boil works its way into your hair rather deeply. The depth starts out at 1-6 inches and gets deeper as you get closer to the boil. The bottom is pretty much all sand. If there are not a lot of people there, the visibility can be unbelievable. Once in the boil area, there is the main boil with a strong upward flow, a sidecave with a very noticeable outflow, and another boil with some outflow. There are also several "mini-vents".
Marine life there can include fish, turtles, albino crawfish(rare), eels(rare). The last time I was there, I noticed a large blue crab hanging out under a ledge. I don't think that he appreciated the fact that I was staring at him from 10 feet away. In case you hadn't figured it out, I like this spring.
What time were you planning on being there? If the afternoon, I MIGHT be able to join you.