mistro - Camping: Catavee, Kinnikinnick, College, Rancheria... Lakeshore Resort is very reasonable, but very rustic.
If you plan on racing, check out the High Sierra Regatta & The Mile High Regatta. If you don't race then don't go there when they have those regattas.
Lots to do there in addition to sailing: horseback riding, hiking, swimming, Rancheria Waterfalls, drive to Mono Hot Springs and soak in the natural hot springs, very good mountain biking, watch satelites and shooting stars at night, look for bears..... Check with the Ranger Station at Lakeshore to see what else there is to do up there in addition to sailing.
Enjoy your vacation next summer.