Unless your party consists of very strong swimmers then going by car is the preferable option. Get there early, or late so that you miss the crowds. Enjoy the walk down to the beach, have a drink and/or food at Top of the Baths or Mad Dogs on your return and you have the car at your disposal to see the rest of Virgin Gorda. Don't forget to take your National Park certificate with you or else you will have to pay again to enter the area. There are lockers available at the beach to leave anything you don't want to carry through the Baths themselves should you wish to use them.