Course is set and it'll be a lot of fun.
A note on the construction on E. Ashmen. When you come to the park approach FROM THE EAST!!!! Figure this into your directions otherwise you'll have to take a 2.5 mile detour if you approach from the west (therefore approaching from the east anyway). There are still detour signs if you come from the east but you're "allowed" to go to the park. Check the map for the park HERE and plan accordingly! Ashmen road is closed(ish...) between Waldo and just before the park entrance.
If you're coming from the south, I would take the Bay City Rd. exit and head east to Flajole Rd. Head North on Flajole and take W. Wilder / E. Ashmen to the west. Continue through the detour signs across US 10 to the park.
If you're coming from the north, take the Wheeler/Waldo Rd. exit and head East on Wheeler. Turn south on Rockwell and West on Ashmen. Proceed through the detour signs across US 10 to the park.