There are really three good campgrounds on the loop,, in my opinion.

Pinecliff has a general store and is situated near the lake, it may still have a gas pump as well. As you come in on the main highway, you take the right, instead of turning left into town. They have pay showers available. We had a bad experience at Pinecliff when on their retiree employees came chasing after my daughter and accused her of stealing some gum. The old bitty even forced my daughters mouth open. NEVER been back there since.

I would suggest Silver Lake Resort as the top pick. It has a general store and the world famous Silve Lake Cafe (open for breakfast and lunch). There is a nice public campground at Silver Lake as well.

Another option is the Mammoth Lakes Campground, which is on your left as you drive into Mammoth Lakes. Showers are included in your space rental. They have an indoor pool and hot tup as well. Not the best or warmest but they are available. Mammoth has quite a few lakes available to fish as well and would make a good base for traveling to June Lake Loop.

Don't forget to eat at the Whoa Nelli Deli up at Lee Vining. It is located at the Mobil/CHevron station on the road to Yosemite.