Amazing campground
Lake Morena is an awesome place to stay. This was our first campsite during our PCT thru hike, approximately 20 miles from the Mexico border via the trail. They have a number of campsites and it didn't seem like they filled up too quickly. Other than thru hikers, there were only a handful of campers around.
The campsites are a bit of a walk from the lake, but there's a lot of great resources nearby. There's a campstore a short distance from the campgrounds, and a full bathroom with showers.
There's lot of great hiking nearby, particularly on the PCT, but it's also a great spot to just relax and unwind. There's a lot of turkeys that were wandering around in the morning.
There's a number of signs about the water not being potable. The ranger told us he drinks the water, and we drank it without filtering and we're fine.