Lake Mary is a very nice campground. Large open sites with pines surrounding you. Some have tremendous views of the lake or even the mountains. Our site was directly next to the bathrooms, which we were initially worried about but it wasn't an issue for smell or noise and quite nice at 3 in the morning. There is a very nice divided paved path that meanders thru the campground. We saw lots of bikers, walkers and runners pass by. The lake has a plethora of activity options and we would have enjoyed them if we'd had the time. We were simply there to acclimate for our trip on the JMT. The trolley system in Mammoth is extensive and extremely useful, not to mention, free. Learn about it and use it. For those looking to hike/backpack Duck Pass Trail/The JMT this site isn't the closest campground but with all others full it worked out well. It was a couple miles to the trailhead but when you're walking for days whats a few more miles.