I have camped at Falls Creek Campground twice in the last two years. My family (two adults and one child) had site 15 both times and camped with a tent. The campground is on the lake, and several of the sites are right next to the water. Several of the sites are next to the creek. The campground is clean and well kept.
After staying one night at site 15 which I was able to reserve online, we decided to stay a few extra nights by claiming one of the walk in sites. There are 10 walk in sites located across the creek from the main campground. We stayed at site 30, which was near the end of the trail close to the lake. It's not possible to reserve the walk in sites online ahead of time. They are first come first serve and must be registered by going to the front desk at the lodge which is a short walk from the campground. You can reserve these sites on the day you arrive only. You can reserve them for multiple days in a row once you arrive. In the busy summer months, the walk in sites may be hard to get since so many people want them. The front desk people advised me to arrive in the morning if I wanted to get one because they go fast. There is a small parking area for the walk in sites, which may not have enough spaces for all the cars belonging to the walk in campers so once you get a spot you may not want to leave it.
There was no camp host on site this year. There was a sign indicating that the camp host was at Willaby Campground (a short drive down the road). I brought my own firewood with me, but there were signs that firewood and ice were available for purchase (either at Willaby, the lodge, or the Mercantile... I can't remember where it was). If there was an issue, I can see how it may have been a problem having no camp host on site, but luckily there were no issues for us.
Overall, I think it's a great place for camping and I will return. The lake is great for swimming. The Lake Quinault Lodge is a few minutes walk on a path along the lake, where there is a raft for jumping off, boat rentals (kayaks, canoes, rowboats), plastic adriondack chairs, and ice cream treats for sale. Inside the lodge there is a gift shop and restaurant.
There are no showers at the campground, but if you go to the lodge, you can get access to the showers at their indoor pool for a fee.
There is a great store across the street from the lodge called the Quinault Mercantile that has all aorts of supplies, groceries, and food made order including stuff like sandwiches, burgers, and pizza (slow but really good).
There are also a lot of hiking trails in the area. We went on a short hike on the Loop trail which was a nice walk through the rain forest.
Also worth doing in the area: Go see the World's Largest Spruce Tree. Take the loop drive around the lake. Drive about 30 mins to get to the ocean. read more