Comments: 
I think the bike path is big mistake that could have irreperable negative repercussions for the island. Lionel laid out the biggest problems in his email. I'd like to add a couple additional observations. 
1. A bike path on Chappaquiddick will likely quickly become the most popular bike path on all of Martha's Vineyard (on account of the bucolic and relatively car-free nature of our island). Do Chappaquiddickers really want to contend with more congestion getting on and off the ferry, more bicycles on the roads, and more people on the island? 
2. Increased bike traffic will bring increased litter. As I write, there is litter in 4 spots on Litchfield Road--something I have never before seen so close to home. Can you imagine how much trash off-islanders will scatter along Chappy's roads if there's a bike path? 
3. The proposed bike path will be on Chappaquiddick, but I question how much it will really be used by the locals as opposed to how much it will be used by off-islanders. I'd bet that the majority of users will be from off island. 
There are many places in the world where people can ride on safe paved bike paths (starting with the rest of Martha's Vineyard). There is virtually no place else on earth like Chappaquiddick. Bringing change is looking for trouble. 
Thank you for your consideration and please forward this note to any appropriate parties. 
Steven Raichlen