Rainbow Lake Carry-in is a short 100-yard hike from the picnic area parking lot, making it the most convenient boat access point at Straight Lake State Park for canoes, kayaks, and other non-motorized watercraft.

An accessible fishing platform is located next to the carry-in launch, and courtesy boat/canoe/kayak carry-in carts are available at the campground parking lot from May 1 to October 31. Note that boats and watercraft cannot be left at the launch overnight.