rec.gov id: from recreation.gov/camping/campgrounds/<id> ·
goingtocamp mapId: from the mapId= param in the booking-results URL on washington.goingtocamp.com ·
Sno.Co. Parks park id: from the Select-a-Park dropdown on reservations.snocoparks.org (Kayak Point = 2001).
Adding creates a watch for every remaining May–Aug weekend.