Hi--
I definitely did a little post-dinner exploring! Definitely be sure to bring a map along, because it proved difficult to ask for directions!
Some of the nights are later than others, because one night we went to a Kabuki theater and the show didn't get out until around 10:00. Other nights I walked around quite a bit. Tokyo was the best place for exploring, because the subway was really easy to use and there are always a ton of different things going on!
Have fun!