OP again. We definitely plan to use public transit and uber to get around in the city. Night visits to monuments sounds great. We're experienced city visitors, but are a little freaked out by the reports of subway violence in NYC - do you feel that riding the trains, etc in the evenings (or anytime) is particularly ill-advised? Of course, we're always careful and on the lookout for suspicious stuff...
And, while I've got your attention, we plan to visit Delaware, via Annapolis/Hwy 50. Probably just for a long day and evening. DE is the last state on my list - I've visited all of the other 49! My thought was to drive across the state, maybe to Rehoboth Beach, and then back to Annapolis, maybe by a slightly different route. I haven't yet researched the area, but any ideas? With such a short time, my goal is to see the countryside, maybe a few small towns, etc.