We will be in NYC for 5 days and staying in TS and going to the usual touristy places. We are 2 adults + 2 kids. For a day , we will be around TS, CP, TOTR, Lego store so it should be mostly walkable. Do we need to buy the 7 day metro card? If we don't, how do you get on the Roosevelt Tram? Can you just buy a ticket there?