Go for an evening walk along the waterfront at Port of Saint-Malo. You'll be charmed by the sight of small boats gently bobbing around under moonlit skies.
You'll be spoiled for sightseeing choice when staying in Saint-Malo. Port of Saint-Malo is a good place to begin here, but there are numerous other worthy spots to check out. St. Malo Citadel, St. Vincent Cathedral, and St. Malo Beach are not far from the yacht and boat harbor and will round out your day nicely.