Well, I can see both sides of the coin. She wants to spend time with YOU. And, to her, you probably act very differently when in femme. But, she should also understand that you want to have some fun too. Why not meet in the middle? On vacations, my SO and I bring Camie along but he also spends time hanging out with me in drab too and knocking back beers. I find that when he dresses, it can be a little stressful for me. Many, many hours (like half a day) is spent removing body hair (he's Polish)...more hours are spent with me shaping eyebrows and doing makeup...more hours spent with pictures. And, all of this is fun, but sometimes I am like, "Damn...I want to be on the beach right now!" So, we meet in the middle. Maybe spend the day with her in drab and the night in femme? Or maybe spend a day or two in femme and the rest in drab?
Plus, I think that we maximize the time he spend in femme and just really have fun with it. But, he knows that I expect to spend time with Ryan too at the end of the day. I love my Camie time, but I also love my Ryan time. So, I see where your wife is coming from with all of this.
It's a relationship and you have to realize that it's her vacation too. But, I understand that it is also YOUR vacation. You got married and you knew with marriage there was going to be compromise. So, make you wife happy by not spending the ENTIRE time in femme and make yourself happy by taking the time to enjoy yourself in femme.
Talk to your wife about this and see if she finds that more reasonable. Tell her that you want to be there for her and connect with her and have fun, but you also want to take a little time to dress. See if you can't find a compromise that will make you BOTH happy in the long run.
I hope that this helps.