There's plenty of skiing. I don't know how long the season stays open, but last year there was lots of snow through like May.
Or, maybe something more like mountain-climbing? I remember a year ago some people died on Rainier this time of year, so I know you can get out there and climb it if you're that crazy. :-)
It's not as adventurous as white-water rafting, but you could go kayaking. Maybe kayak with the whales -- that's more exciting than kayaking without whales. I think that time of year you're looking at gray whales not too far north of Seattle....
For the wines, there's several wineries in Woodinville, including the one mentioned above. But you can do several.
So, here's my off-the-top-of-my-head suggestions:
- Go skiing in Stevens Pass. When you get tired, drive back to Woodinville, and visit a Chateau St M and/or Columbia.
- If you like going down snowy mountains but not on skis, you can go down on innertubes. It's not technically challenging... just fun. Sledding with a serious twist.
- Go to Leavenworth. There are some crazy hiking trails that give some amazing views. They're tough, but supposed to be wonderful. It's walking, yes, but very ... challenging walking. After wandering in the mountains, come back to Leavenworth and try the beers. It's a Bavarian-themed town, so you have some good beers. Hiking+goodbeer+good brats = good day (I think).
- Hook up with a company that climbs Rainier. I bet they have one-day pkgs that let you ascend to base camps of some kind at least, or something. You're kind of far away from wineries, but there are nice nearby ski lodges you can kick back in, have time around the fire with beverages of choices.
- Kayak on the Sound with the migrating whales. Hit Woodinville for wine and warming up that evening. Or find an elegant hotel downtown, stay on a high-up floor, and watch the boats go by before heading down to whatever fancy bar with a big fireplace and maybe a cigar room that they have handy and ask the sommelier for their recommendations.
- Take a ferry to the Olympic peninsula. There's rain forests to see and there's mountains to climb there. And I'm betting there are some great mountain biking paths. Get up early. Stand on the back of the ferry, in your shorts and your sweatshirt, drinking your obligatory coffee, watching the sun come up over Seattle. You'll freeze, but it's amazing.
- Snowmobile on Mt St Helens. Last time we were there it was ... May? maybe still April? ... and there was a ton of snow and lots of snowmobilers. It was a beautiful clear day.
- Snowmobile in the North Cascades. Get as close to Washington Pass as you can. It may not be open for crossing, but you should get close enough to get to good snow. I think there are some hidden hot springs out that way, too.
Really, it's not that cold in march. You have to seriously dress for the weather, but if you layer properly, and you take care of things, you can hit the water and live.

I don't think the rivers are rushing yet in March, usually -- the snowpack isn't really melting like mad (someone correct me if I'm wrong, I'm still relatively new here), which would be why the other trips don't start tilll April. But that does give you a ton of snow to play in.
No idea about driving a tank. There are parks where you can go SIT on an old tank, but it's not functional anymore!!
Quad Biking - it'll be muddy most places you can do that in March -- which is why I suggest snowmobile. But if you want that, do your searches under "ATV" (all terrain vehicle) or "4-wheelers" or "3-wheelers" -- that's what it's called here. For example, google gives me this:
ATV Action Tours home
Good luck planning your day! Hope you enjoy the area!