Drummond for sure. I wouldn't say "don't wheel Drummond alone". If you have another Jeep to go with, great, but if not, it definitely shouldn't stop you. Just be cautious of the mud. There's water on all the trails, but most have solid rocky bottoms. However, there is one very muddy section (wish I could point it out on a map) that has deep mucky holes, and I won't ever go on that section again for what it did to my Jeep.
If you do go to Drummond, stop by Wazz's Party Plus gas station on 134 to pick up a trail map. You'll pass by there anyway. They also have free air for refilling your tires.
The DNR trail map is practically useless:
There is also Turtle Ridge Offroad Park which is private land:
Never been there. Everything I described above is state land.