I feel it should not be an issue, but I guess all guys would feel that way.
Do yourself a favor and make romantic plans for the weekend BEFORE you go! Something done afterwards to make up for it won't have the same effect as something done before. Again, it shouldn't make a difference, but women's minds can be strange things. In many woman's mind's, something before the trip can score as many points as not having gone on the trip. But, the same thing done after the trip becomes something done out of guilt to make up for the bad thing you did(going on the trip).
This could end up being one of those things that is held against you forever if not resolved before you go.
As buffalowhawk implied, a situation like this can be a good litmus test as to a woman's attitude in the future. If something like this is a major issue today, then similar issues will be problamatic in the future.
Last thing, remember guys, encourage your woman to take a trip with some girlfriends. One time a friend of my wife's asked her to go to France with her for a week. She was hesitant about asking and how I'd feel. I bought her plane ticket for her and insisted she go, knowing that then I'd be owed similar consideration when it was my turn for a "Mancation".