A pleasant hike from the beach itself, you can make a lovely day by going to Life is Sweet and getting some tasty cupcakes to bring to the water with you. This tiny shop is on the very easternmost edge of what I would consider the Beaches, but it's definitely worth the trip.
The inside of the store is a bit twee, but in an endearing way, with lots of cute trinkets and some gourmet items like organic coffees. The best way to go when you get inside is to get the sampler box of mini-cupcakes (which cost around $6, I think). You can pick and choose from the flavors and share them with your friends.
The outstanding flavors are the lemon drop (vanilla cake with a lemon curd center, mild lemon icing), the earl grey (tea cake with orange icing). The white chocolate has really tasty icing and the mint chocolate and double chocolate both hold up to popular favor. The best part is that none of the cakes or icing topping are too sweet or grainy, just light and fluffy and pleasantly flavored. Go nuts!