For GPS purposes, the address is approximately:
69401-69499 8th Ave, South Haven, MI 49090

From M-43: At the traffic circle at Maple Grove Corners, take CR-689 north to the T-stop at 8th Ave. Turn right (east) on 8th Ave, and look for the preserve on the south side. If you get to 68th St, you’ve gone too far.

From I-196: Exit east onto Phoenix Rd. (exit #20). Take Phoenix Rd. about 1/2 mile to 71 1/2 St. Turn south onto 71 1/2 St. and go 1 mile to 8th Ave. Go east on 8th Ave, about 1 mile and look for the preserve entrance on the south side of the road.