ijgordon NYCRachel,
Thank you
so much for all your wonderful recommendations!!! I can't thank you both enough.

I will be arriving into NYC fairly much blind, so all your kind suggestions are of such great value and we'll be sure to make the most of them. From you've written, too, I'll certainly make a mental note of the R-C spa prices and also the ease with which costs might well be racked up even when spending on not very much, e.g. in-room dining.
Genuinely, thank you both so much once again!
All the best