We used the Family Bike & Boat Plan on our last trip. It is for up to 5 family members and is $198.00 plus tax for your length of stay. We stayed 2 weeks at BWV and then moved to VWL for our last week and we were able to use bikes or boats for the entire time. If you are staying a shorter time, the price is still the same. You can use water mice, pontoon boats, and regular bikes (not surrey bikes). They like you to check in with them after 1 hour of use.
You have to pick one marina/bike barn that you will be using during your stay. We picked VWL because it has access to the biggest lake and biking to Fort Wilderness is fun.
Have fun!