Dang, nice ride, looking forward to seeing it!
We are not particularly active in the winter and some of us park the Z, me primarily because my tires suck in the rain. Anyhoo, the Z Car Club of Washington is a fun group of Z owners and we're very slowly getting more 370s to come out for our long drives and show and shines, a lot of Z32s and 350s. The Bremerton Sports Car Club and the Western Washington Sports Car Council are the big auto-x organizations up here and there are some great locations for events, Pacific Grand Prix is a purpose-built 0.82 mile outdoor kart track that has car lapping days (I've only done one but you get a lot of track time for the money) and Pacific Raceways has 2.25 mile road course that numerous car clubs around the area have track days and the track also has open test and tuning days.