Anywhere you are and there is water around, there is going to be marshy areas and that is true of Point Lookout. There are also going to be bugs if it's warm/hot. If it rains, that adds to the marshiness of the area and there's not much you can do.
We have several places that we go to the beach (ocean) and those also have lots of bugs, is marshy, sandy and all that goes with the ocean.
That's part of being outside in nature, or at least, my idea of nature.
We just load up on bug spray first thing in the morning, and spray every hour or two, just like we do with sunscreen.