I was in NYC in April with dd14. I had bought us both a 7 day unlimited public transportation card. We traveled plenty on the subway and got our money's worth compared to paying per ride. We were in NYC Saturday and left Tuesday so there were time left on the cards. We ended up taking a cab to Port Authority to get our bus home. As we were getting ready to leave the cab I asked the taxi driver if we could give the cards to someone else to use. He was surprised but asked me if he could use them. Sure we had no more need for them. He acted like we gave him the biggest tip of his life.