If you can pull it off, your best option is to camp on Rialto Beach. It’s a backpackers paradise and an easy 10. A backup option would be Mora Campground. It is a traditional National Park Campground that you can access year around. It has about 94 sites with water and bathrooms and its about 3 miles from Rialto Beach. It makes for a good base camp for all of the river and beach access in the area.