The New York City Fire Museum in located in downtown Manhattan on Spring Street and is easily accessible from the 1,2,3 and A, C, E trains.  The museum is open 7 days a week from 10am-5pm and entry is $8 for adults and $5 for kids and college students.  

The space is 3 stories with the first 2 housing the museum and the third that can be reserved for private events.

While not a large museum, visitors get a nice glance into the history of the New York Fire Department and how the department fought fires over the past couple hundred years.  

The space is close to the Hudson River so you can go for a walk along the water after your visit (about a mile north will take you to the Whitney Museum and a mile south is Le District if you want a nice lunch.)  

The New York City Fire Museum is a recommended visit for families and people visiting the city on a weekend looking for an activity that will take about one hour.