The best way to enjoy Manhattan is from Brooklyn. Transmitter Park offers views without the crowds, and you can pick up coffee-to-go and treats from nearby Ovenly. The India St/Greenpoint Ferry is a 5 minute walk and will take you all the way to the Rockaways in the Summertime.
Part of the Marlow restaurant group, Diner is one of the more casual / rustic options. The menu changes daily and is written out (most likely upside down by the wait staff) on your table or the back of a receipt. The only constant item is the burger, which to be honest, is one of the best in the neighborhood. If they have a breakfast sandwich for brunch, get that. The fried chicken sandwich (with dark meat) is also a favorite. They make scrambled egg dishes better than most. Dinner is solid all around (they crush a steak for two). Homemade ketchup and dijon mustard are on every table, so regardless of what you get, these two condiments are worth the visit.
The Peruvian pisco sour cocktail is among my favorite aperitifs - you won't find it better than here. A lot of people know this bar which has been around for many years, what they don't know is that the dinning is actually really good. Blinis & caviar with some bubbles are the perfect way to continue after the aperitif :)
Rudy's Pastry Shop is a little place my boyfriend and I like to go to on Sunday mornings. The place is super small and cozy and full of all the sweetest treats you can find. They have such a large selection of pastries and the coffee is just as delicious. The location is cute as well and a nice place to stroll afterward. There is a cute record store right around the corner.