Kids visiting - need ideas for UES (or even UWS)

My college bestie is visiting with her 2 kids in early April (1-5) and I want to give them the best experience! One is a 12 year old tween girl and a 10 year old boy. They are very sweet kids that are very close, but naturally the big sis is the one who is going to dictate the schedule. She's already made a list for me - Jelly Cat Cafe, Museum of Ice Cream? and shopping (I'm sure many of you Moms of tweens know exactly what these stores are!). The son is a huge baseball fan (Padres as they are from San Diego, and his next favorite team - the NY Yankees! ). I know it's Opening Day/weekend and getting tickets will probably be tough but I'm going to try and surprise him with a game (Fri or Sat).

I've got museums, Central Park, shopping, maybe a broadway show and one NYC landmark (Statue, Brooklyn Bridge) if there's time in between all the shopping (I'm already tired.. haha)

Anything else on the UES that could be fun? They always ask me -- what are NYC kids like? So wondering if there are fun kid-friendly restaurants or cool activities they can do to be amongst kids their age? Open to any suggestions and THANK YOU in advance!