If you've been to NYC before and feel like you've done all the classic stuff, we highly recommend taking a short ferry to Governor's Island. It's an abandoned base with entire barracks and gorgeous houses that have all been left as they were. It's extremely peaceful and eerie at the same time. You can walk the whole island thanks to its paved pathways and you can also rent bikes to cycle around. There's a small hike that takes you to the top of the island for amazing views. There's plenty of food options too and sometimes they have pop up markets as well! We go multiple times a year and it's one of our favorite places in NYC.
Take a stroll down our street (Joralemon St) to the bottom and see why we have been living in our tiny apartment for over 3 years. The Piers in Brooklyn Heights are a landscaping heaven. Take a gorgeous walk from Brooklyn Heights all the way to Brooklyn Bridge Park in Dumbo along the river and through the "woods". It's truly an escape from the hustle and bustle. We highly recommend exploring Pier 6 and Pier 3 on your way!