Original poster forgot beautiful in addition to small and quiet. Adjective describes both Twisp Municipal and Metho Valley. Both of these airports seem to be outside city limits. Is there just a shortage of paved snow, mud, clear walking areas in the area in the Spring? I can understand that. The runways and taxiways are cleared and so "available" for spring fever sunny days? This is the land of big wide open spaces and rural scenic beauty...clearly based on photos. You hate to use county resources to handle something like this, but an incident could certainly happen and a taxiway/runway is no place for non-plane related operations.
I came close to shutting down when there were many ultra lites on an Arkansas field (no notam) when I arrived after a two hour flight. As I taxied into ramp/tie down area there were a LOT of people hanging around on ramp. A child, (young boy <5) was walking toward me (about 50' away) unattended. I came to a stop with hand on mixture...about three seconds later an adult came and grabbed him. He was clueless to the danger of course.
I wish you well in getting a handle on this. A civil discussion likely won't help, but likely wouldn't hurt either? I have an ongoing challenge with my dogs in a county (somewhat secluded park). When entry gate is closed (seasonal during winter) you can walk in. I have two pointers and this is a great area to excercise them daily. I have E collars and dogs are trained to return to heel when they encounter others. Majority of other pet owners don't have control of their dogs and they run over with hackles up and aggressing. nobody wins if a dog fight ensues. What to do? I go a couple hundred yards away from parking and enter at an alternative fence opening. STILL others dogs will launch running a couple hundred yards...owners yelling and maybe, maybe not coming over to get their dogs. Eventually their or my dog are going to do something...two bites and your dog is euthenized. Even when you try not to be that guy others out of ignorance or live free, what can happen inattention will eventually eliminate dogs from being allowed in the valley. Freedom is great until someone elses results in your having a problem. Humans. (shrug)