re: Anyone have experience with a camp on land on pilings?

You just have to make sure that the pilings are braced to one another sufficiently. If not, they'll move separately and tear up. There's a camp in Maurepas that fell in the water 1 year after it was built. I'd honestly get someone that works with that type of building to take a look at it. Our camp on Blind River was only about 8' off the water and it started to lean. We had to jack it up, level it and add a ton of bracing two years ago.