Lopez is probably the best camping in the area, been going there for 40 years and have been there the last 4 saturdays. Lake is small but fun, clean and blown out every day after about noon but almost no traffic. Camping is quiet and mostly families.
The only thing to be aware of is they are very strict on the mussel ban and will inspect your ski every time you come in the gate. If it is not completely clean and dry they will not let you in so don't expect to ride Pismo then come straight to the lake.