We stayed at Lake Hemet during a weekend in August and it was super crowed and hot. It has all the amenities to make for great car camping and fishing but a bit too noisy. Would be a great place for to camp with children. RV's and tents welcome. There's even a store at the entrance of the park if you need any last minute items you forgot. It's about 15 mins from Idyllwild if you want to escape the heat and/or do a little hiking.