Yep, the ferry is 24/7 now. Cost to cross is $2.50 usd one way before 8:00 PM, after 8:00 PM it goes up to $5.00 usd each way.
From CM to town is about 20 minutes. I'd suggest stopping by the Hammock House there at the cut; nice people, atmosphere, and they have a great happy hour.
One last tip, the ride can be very rough. We figured out the more weight you have in the cart the better the ride is, so we always had four people in the cart.