Slip Bluff Park is conveniently located next to the Rest Area Welcome Center in Lamoni. Head west across the road after parking and look for this sign. You'll walk a tenth of a mile on a gravel road before seeing the Slip Bluff Green Trail sign and from there it's a wooded dirt trail. The green trail is a 1-mile loop. There's also a blue trail that overlaps with the green trail for a total of 2.5 miles. I couldn't find a trail map online, but the trails are well marked with signage.