I wouldn't necessarily recommend trying to do all that on the first day. If you get going early, you can definitely get to NS, but I wouldn't suggest doing a stop at the Baths on the way. Rather, consider sailing to NS Leverick Bay and pick up a ball there, rent a car, and do the Baths in the late afternoon. The Baths is best experienced early in the morning or later in the day. It gets and stays crowded mid-day.