I would treat the date just as that a date...pretend like you are getting to know each other (all over again) because truly you are since you have been separated. You have lots of nonR things to talk about since you both don't really know what you are doing in your "other lives" just remember that the op is noone you know, care to know about. This is YOU spending quality time with the one you love. Focus on them, let them talk and as NYS always says validate them.
When Dave and I had our date a few weeks ago, I dressed my best, wore his favorite fragrance (and I mean HIS fragrance that he wore)...we had a great time throwing darts (our shared hobby that ow doesn't share)...we kept the talk to fun stuff...it was very akward and then we did slowly drift into R talk but for us it was a very cleansing of the soul experience...it was needed because of all the drama the past few months. Now of course we really haven't talked since then and truly now in hindsight it may have become the closure we both needed on our R. But we left on a great note and there was no pain...no tears, lotsa laughs and only one tense moment that I was able to turn around.