Hey there Esky, I'm from just down the road in Happyrock. I can't suggest any ORV trails, as I am a off-road rookie. Hiking wise, have you ever been up to Pictured Rocks? Lots of options there, short day hikes, and multi-day excursions. Wife and I did a short 6.5 hike end of August around the Chapel Basin loop, awesome. This weekend is supposed to be nice, sunny & low 70s, may be a great opportunity to do some hiking there, colors should be just about right. There's quite a few waterfalls there also, so lots of stuff to check out.
Here is link to Pict Rocks maps
Pic at Chapel Beach
We were supposed to go hiking there last weekend, but too much stuff to do with the kids, plus money is tight. Would love to get up there, but this weekend is booked for us also, crap.
Hope this helps!