I've got a 15:40 - 08:55 NRT-HND transfer coming up May 30-31, so I've booked the MyStays HND (if that's not the best option, I'm open to suggestions). Any thoughts on the best way for 2 people to get there without spending a ton of money on transport? We'll only have two bags (one carry-on, one checked).

Also, will I need to change currency into yen to buy train tickets at NRT, or is it possible to buy them with credit card there?

Finally (and probably least importantly), I'll probably get to the hotel around 6 or 7. Is there anything in TYO I could actually go see at that point, or am I better off just getting dinner and going to sleep? It's my mom's first time in Tokyo, and I'd like her to at least see something