Here's the low down:
There's really a couple of different regions (more so than just north, west, or central).
South West - is the hilly area. Way back in the day the glaciers didn't hit this area (South of Tomah to Iowa), and the result is a massive amount of hills, ridges, and cliffs. Big Hills. There's tons of biking in that area, but believe it or not it's a ton of farms so they're aren't as many trees. If you are into Biking though South west Wisconsin is the place to be. (look into Sparta, WI).
West - This is mainly areas in an around Hudson and Menominee. Basically this area is farmland, and is starting to become part of the Twin Cities Metro (at least St. Croix County). There isn't much
Central - This is mainly a 40 mile radius around a little town called Abbotsford (where hwy's 13 and 29 meet). It's basically farmland and cheese factories. It's small town life for sure, but there isn't much in terms of trees and scenery.
East - Urban. The Coast of Lake Michigan from Green Bay to Chicago is pretty urban. There are swaths with a few small towns but for the most part if you drew a backwards L starting with Madison up to Green Bay you can bank on Shopping malls.

(Exception is Door County which is UNBELIEVEABLE for scenery (you may want to look into this).
As for the most scenic place - head north. Wausau to Rhinelander is gorgeous. Wausau has some World class Kayaking. The northwoods is dotted with little tourist towns, gorgeous scenery and tons of outdoors activities. I'm partial to Lake Superior coastal areas (Ashland and Bayfield).
Anyway that's my take on Wisconsin.
Though I'd like to make one suggestion... if you really want to move somewhere with unbelievable hiking, biking, outdoors stuff, kayaking, etc... I suggest Marquette, MI -- it's only a hop away from Northern Wisconsin and it's GORGEOUS. Especially Presque Isle park. Look into it.