Hi Matt, I was wondering if you were doing that sort of holiday because it's what your wife expects of a holiday. Perhaps you could try to mix it up a bit.
I travel solo and my holidays normally involved flying somewhere, drinking happily at the airport and on the plane, checking into a nice hotel, drinking till all hours, getting up hungover and spending half a blurry day seeing the city (so I could say I had) and then drinking like a fish again. The first time I took a holiday sober I had to rework a lot of things, like making sure I planned sober activities (with other people) into the evening, running in the mornings, etc.
That said, my observation is that unless you are going to a country where they don't serve alcohol anywhere, no matter how much you revise your holiday mode, there is still a lot of temptation on holidays. So for sure, you have done excellently.
I would not worry about being difficult with your wife by making the choices you have e.g. not staying at the casino, or suggesting another type of holiday in the future. Seven months' sober? She has her husband back so you've done the best thing for yourself and her already.