There's good riding that keeps getting better in the area.
Underdown: This place is big and rather out there for WI riding. You don't want to be biting this whole place off without a compass, lots of water and a map. The builders have added new bridges and berms. I've ridden here for 23 years and what was once logging roads and horse trails is now a network of single track. A good dose of this place might cause your basic S. Kettles customer to cry or poop pants. If you can ride _all_ of Blue Mound you can head from the trail head down to T and TT trails and not regret it. Consider it a longer distance like Kettles Blue/Emma trip but you need your pump track, root and rock skills.
This weekend is the second time I was there when the slight change for storms became real. We were in rivers of water about .8 the way through with return to sunshine an hour later.
Washburn Lake: Big thanks to the Rhinelander diggers. This is another I've ridden for 23 years that keeps getting better. There's still some old school tight and twisty stuff but you get the picture when you're in the new with good bench, berms, bridges and flow. My usual ride here is clockwise and that's the way to do it to maximize fun in the new stuff. I usually start at the old Washburn trail head but Walter and I did the Perch Lake trail head this time.
Others I like that are near are Raven, 9 Mile, Hansen Lake and Mud/Crystal Lake (Smokin Spoke). Hansen Lake can add more to your day if a loop at Mud Lake or Washburn are not enough.
Hansen Lake trails and trail head are not marked. You can park by the landing near the airport or highway exit. The place is braided with trails but a main loop takes you around the lake and toward the edge. Some TTF that was present is now in ill repair but people are giving bench love to places that have needed it. You can swim to spots here.
These are all 15 - 40 minutes from our cabin so give a shout if you're in the neighborhood. We do whitewater, flat water, sailing and fly fishing for musky when not biking.
3 vs 5 - 7 hours of road time and lots of sleep and eat options are part of the beauty of this area.