Dessert in or around Bayville, LI
Gooseberry Grove is in OB Village. It's an ice-cream parlor, selling candy etc.
Beware though, the Oyster Fest is this weekend, so avoid 106 as your entry way, the whole Village is mobbed all day, both days. You are better off entering from the other end, Bayville Avenue, from Locust Valley and avoiding Oyster Bay all together. Maybe someone else knows of any ice cream parlor or dessert stop in LV. I do not.