I was there last week around March 27th. Parks service was in and out several times and as stated before park hours were sun-up till sun-set. No charge for diving right now but there may be in the future as there is talk about a board walk going in and boat ramps per the park service people from Walton county. Vis in the basin sucked but was gin clear in the cave and cavern. Local fisherman estimated water levels about five foot higher than normal.
Hope this helps!