Hello Bonnie, Merrill Campground is located in the Eagle Lake Recreation Area of the Lassen National Forest. This recreation area has five campgrounds, three designated day use areas and a marina on the south shore of Eagle Lake. All of these recreation facilities are connected by a 5.2 mile paved hiking/bike trail. I hope this helps. Thank you, Vista Recreation.
There are paths connecting the campgrounds to the marina. Probably a couple miles. There are others but I have not explored them yet. The road around the lake is wide and lightly traveled. I think you could have a pleasant time there as well. It's miles and miles around.
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