Summit lake is a great place to hang.  There are campgrounds on either side of the lake and this one is the more primate of the two - no flush toilets.  That said there are some sites right on the lake and an area just for tents- no generators!

Some sites are a bit open - due to elevation tall trees with little underneath - so some sites not real private.

The location is good and you have easy access to both sides of Lassen.  Also connected to great hiking.