Also I say take the cab from LGA just because Uber and Lyft freaking blow for EWR pickup. Might not be as bad at LGA tho
LGA has a fine Uber setup it's just a jaunt to the garage where they all gather. Not sure if cabs are a different or same pickup spot. I feel like it was the same.
Kdub I'd get a hotel by JFK, go from lga right there, drop bags, Uber to Manhattan. Don't futz with the train, it's a pain.
Where would I go in Manhattan? 9/11 monument is worth seeing. I go there almost every time I go to NYC and I'm not one who likes touristy or sad things . It's impressive to see. Eat at dead rabbit which is close and pretty low key