Twin Lakes Campground, California: 94: 93.7%: Source: The Dyrt. To read more detailed information about the top 10 hardest-to-book campgrounds for 2024, click here. Suggest a Correction ...

The campground, which has only 32 campsites for RVs and tents, is fully booked more than 97.5% of the year, the website found. There are a handful of first-come, first-served campsites if you are ...