Ooh I forgot to mention the cable car to Roosevelt Island. I can't believe I've been to NYC twice and had never heard of this until recently. I've done some research for next time and the island looks great.
On the subject of prices, I've been recently and yes it's more expensive than in 2018. However, it doesn't have to be expensive. There's loads of great places to eat at reasonable prices, even right in the thick of things. Andrew's Coffee Shop on 7th (not far from Macy's, opposite side of the road) serves incredible food all day
Andrews NYC Diner | New York Diner
Liberty Bagels
Liberty Bagels – Home to the best old-fashioned, hand-rolled, kettle boiled bagels in New York. is the best bagel place I've ever been to. The 'Lasso' bagel is worth the flight alone - amazing!
As for tipping....I don't play those games. It's not a legal requirement to tip and I'm not responsible for subsidising an employer's wage bill. That may be harsh but that's how I feel about it. You're supposed to tip in a restaurant but not in McDonald's but they both serve you food.