Six group campsites -- 3, 17, 23, 39, 49 and 51 -- also are available. No reservations can be made for sites at the BLM's East Shore Campground or the "Tent Meadow" at Loon Lake.

Summer is the season of exploring the great outdoors, but if you want to book a spot at one of California’s most picturesque campgrounds for a weekend getaway, you might be out of luck. In fact ...