I would think twice about riding a bicycle around, if I were you.
I love bikes, and have ridden one all my life, but I wouldn't risk it in Sosua, where bicycles are unseen, unnoticed, and uncared-for.
For starters, just look at the roads. Check out the ditches on either side, check out the size and frequency of the pot-holes, and most importantly, check out the attitude of the drivers.
Suit yourself, but a word to the wise is sufficient.
If you do decide to ride a bike around Sosua, make sure you get a very good helmet.