We've enjoyed staying at the Napa County Fairgrounds, in Calistoga California. It's a short walk (five blocks?) to the main strip in town. Considering it's at the North end of the Napa Valley and a fun and right in the middle of a very walkable and interesting little town, it's a great find.
There are 30 and 50 amp full hookup sites, and some 30 amp sites with W&E only. There's a (small) shower house and a dump station. The sites are gravel paved but pretty level, and pretty spacious. There are some big trees around the outside, with back-in spaces, and pull-throughs with no shade in the middle. No tables, firerings or grills. There's a golf course on the fairgrounds, right next to the RV park.
There's almost always availability, and we can visit for just an overnight as a quick wine country getaway.
Bruce & Dan
2009 Monaco Monarch 33 SFS; W22 Chassis; Safe-T-Steer; Koni FSD shocks; 2010 CR-V Toad