hi
Kid_Eternity , sorry about the delay, the school year started Wednesday and I've been slammed.
manhattan is made for walking but you might not want to be walking too much in this heat. in chelsea you'll be near the 8th ave (A and C) and 7th avenue (1,2,3) subways and it would be easy enough to get to lots of places that way. i can think of the Irish Hunger Memorial
Irish Hunger Memorial - BATTERY PARK CITY AUTHORITY which will take you to the Battery area. once there, gazing out onto the harbor is a very nice thing in itself but you will also be right by the Staten Island Ferry
NYC DOT - Staten Island Ferry , the 9/11 Memorial pools
About the Memorial | National September 11 Memorial & Museum (though imo the Oculus is bullshit, a ton of money spent on a shopping mall) and Castle Clinton
Castle Clinton National Monument (U.S. National Park Service), (though this might be more of interest to local history nuts like myself). in the other direction are two of my favorite places, The Cloisters (while the MMA has a medieval section, this is a separate medieval museum
The Met Cloisters) and the American Museum of Natural History, which is a blast for all ages
https://www.amnh.org/ (warning: it's
very popular and there might be a line down the block espeically on weekends and you do not want to be standing outside this week).
hope that helps!