The subway is absolutely terrible with strollers. Most stations lack elevators, the ones that exist break frequently. Plan to fold and carry your stroller constantly or just use a baby carrier instead.

Indoor activities when kids get cranky: Children's Museum of the Arts in SoHo has hands-on workshops, never too crowded. New York Hall of Science in Queens is amazing for older kids — Take the 7 train to 111th Street.

Central Park Conservatory Garden (105th Street entrance) is perfect for toddler photos and has actual benches. Alice in Wonderland statue near 74th Street is always a hit with little ones.