It would be a straight run across US 2 for you guys. Then a short jog up 75. Pretty easy to find yourself there.
There are a lot of forest trails and roads that are fine for an easy ride. When you get to the island, there are maps that have all the different levels of trails / roads called out. (2wd low clearance, 2wd high clearance, 4wd, and 4wd high clearance / modified). All the trails are doable in a stock H3 and there are often by-passes. Shoot me a PM with your email and I can send you the GPS tracks