We've stayed there a month for each of the last 10 summers ,except 1 year when we went to Utah.
Not sure what info you are looking for. Power and water pressure is good, no sewer issues, sites are reasonably large. We park our 43ft MH,F-150 , motorcycle,bicycles and canopy with plenty of room to spare. Some sites are waterfront ( not nearly as much room) ,some waterview.
Just about every site has a fire pit/ring. Firewood is sold in the park as well as all along the roadsides A few are shaded.
There is a shuttle to take you to the park or Bar Harbor. Walmart and grocery stores a few miles away in Lamoine /Ellsworth. Right outside of the park are 3 different lobster pounds. Any specific questions, let me know