This is a very nice campground.  Most of the sites have shade.  2 of the loops are tents only, which is where we stayed.  Right now, this is the only campground open in the park.  The other one (Sunset) is closed for repairs.  The campground filled up by noon on most of the days, though we left on a Sunday and it was pretty empty at 10:30 am.   I would recommend getting to the campground between 9:30 am and 11:00 am to find a site, then pitch your tent or set out chairs!  This is reduce any confusion as to whether the site has been registered and paid for.  Also, grab a registration envelope as you enter the campground, so once you have pitched your tent or set out chairs, you can pay as you leave to go explore the park.  This is in walking distance to the General Store and the Visitor Center.  The park has a shuttle that helps to get around the park.  Lastly, the General Store has showers ($3 for 8 minutes)