Washington: perhaps the diversity here is about as awesome as it gets. Big mountains (8000' doesn't sound big compared to a Colorado 14er, but when it has just as much vertical relief...), lots of snow (when there is snow).
Excellent and neutral climate. Sure, there is rain and some windy storms, but it's either gray, rainy, or fuckin sunny (well, from may to october). No hot-as-fuck-with-humidity days. Generally not very hot in the summer, not very cold in the winter, but there are places where you can find that if you so desire. Super wet in places, super dry in others. Tons of water, both fresh and salty, with pretty good access anywhere in the state. Excellent climbing. Not too big, so you can travel relatively easily from one area to another. Seattle is pretty slick, save a few political and social flaws. Only problem is that californians are takin over after fuckin up california.
Runners up:
Alaska. Probably my favorite state in essence, because it's huge as fuck, wild (for the most part), insane mountains, glaciers, weather, etc. Varies so much from SE to the chugach to the tundra blah blah. buuuuut, it's huge as fuck. Mosquitos are a mutha fucka in some places
Oregon. Kind of like Washington, but it just isn't quite as cool. The mountains are tamer and less abundant, it's drier, access to water is not as plentiful and pretty much limited to the coast and columbia.
British Columbia. Amazing. I've been fortunate to have been in many areas of BC. Easily the best province. Since I'm a dirty yankee, it will have to take 2nd over washington.