We are going to be doing that in a few weekends but ours sounds a little different. Ours will be rack stored and indoors. Call an hour ahead, they forklift/bull your boat into the water and it there waiting for you when you arrive. With three small kids, it is a no brainer for us. We will also have full use of the facilities which include a pool and such. Our cost is between $1,100 and $1,300 for the summer. Nice thing is, you get a discount for winter storage as they just leave your boat in the same rack. Fully heated.

The marina on the St Johns River will do gated outside storage with unlimited in/out for $129/mo with refundable $180 deposit that includes keys. That includes use of all the facilities at the marina. Bathrooms, washrooms, laundry, showers, boat wash area, wifi, they are a sea tow base, and there's even a big restaurant/bar with a pool and it gets quite fun on the weekends with live music. They are open 8-5 7 days a week and need a 1 hour lead time to launch it. In an event they are closed either call the day before they are closed to launch it or if you come back when they are closed they have courtesy docks and will stow the boat when they open.

Sound decent for an 18ft bowrider? I'm considering doing it for the summer, I'm bored of my lake and it's still pretty low.