As a child my family camped at Twin Rivers annually so it was really fun to go back in June. It is a popular spot for people who are there to float the Black River.
We were hiking the OT from Taum Sauk to Johnson Shut-ins so we opted for a camping cabin to keep it simple. We were delighted to find it had A/C! There are 4 small cabins with a double bunk, table and 2 chairs plus the A/C. There is as little porch: nice for sitting or gear stash. It was clean and simple. Bring your own bedding. Outside there is a big water spigot, picnic table, fire ring, and grill. You have access to the "beach" on the crystal clear Black River. There is a camp store with a good stock of what you forgot plus t-shirts etc.
I love Twin River's Landing and we hope to use that cabin again.