Suzy & Bob,
Jane and I just returned from 15 days at La Perla (2nd La Perla visit) and this time we didn't rent a golf cart. Even if the "road" is passable its really not very practical. Go to Joe's Bikes in town about 1.5 blocks off the water taxi dock and rent bikes for your duration. Biking is great fun and such a great way to truly enjoy the north part of the island, which is our favorite. Stock up with groceries in town or there is always Mata Grocery about 1.1 miles south of La Perla. You can carry food on the baskets on the bikes or they will deliver. Water taxi weekly pass is $120 US per person I THINK. I'm sure someone will correct me if I'm wrong. Enjoy your visit, take a deep relaxing breath and chill.