We live in Kalamazoo and wanted a quick trip out in the tent for a long weekend. We chose the park for it's proximity to home and because of nearby kayak/canoe launches. We enjoy rustic camping and were a little let down with the lack of seclusion on each site (that's to be expected when car camping but the photos and website left us hopeful for more space than was offered). The sites are deep but many are close together. Ours had a little extra room but was next to the vault toilet. There are a few trails in the park that are pleasant and the views of the lake are nice. The staff at the time wasn't very helpful when we asked for nearby hikes. They only knew of a paved trail but on our way out of town we met a couple who told us of many river trails and other hikes nearby. Overall it's a decent place to stay. Personally, I don't find it worth it to have vault toilets and no shower if I'm still going to be in a fairly cramped campground. I'd prefer that they have hike-in sites or offer the amenities of car camping.
A group of us bike from Kalamazoo to South Haven every year using the Kal-Haven trail. We usually tent camp but tried a cabin here this year. It was the perfect option as the campground is right off the trail. They provide linens and have basic supplies (including firewood that they will deliver to your cabin) right at the general store. We also met a group that had hiked in to the primative sites and were using the trail to train for the Appalachian Trail. Everything is well-made and maintained, and the staff is friendly and helpful (they even let us check-in early when we biked in ahead of schedule). Highly recommend for those looking for a place close to the trail and to South Haven. The cabins have three queen beds and a sofa sleeper so they can comfortably hold up to eight people (we had five in our group and I never felt crowded). There's a large table inside and two chairs on the porch. There's also a large picnic table outside, a fire pit, and a grill. They are hoping to expand and add cabins sized for couples in the near future.