You’d have to get to ranger station to obtain permit for use of campground on the day of your trip, so arriving early or on time at ranger station in the morning is helpful. Once you get the campground permit you then can hike into your destination. There are people who would camp anywhere if they can’t find campground after sunset. We camped at Skeel’s Meadow which is by a creek for fresh water usage (and refreshing to soak your feet in!). No facilities so mark a tree and follow LNT guidelines. No campfire allowed.