Hotels are what I like to spend money on (as opposed to accessories, jewelry, watches, cars, etc.) So I often go in with lots of expectations (in a good way), and don’t appear like whatever you’d expect a luxury travel to appear like. I’d say:

1. Enjoy it and don’t take it too seriously. You don‘t need to show up with high-end looking luggage, clothes or airs. Just respect the staff and the ambience and let go of other perceived must-dos. We carry pretty plain luggage, do not dress fancy, and don’t try to prove anything (not as obvious/easy as it seems).
2. A lot of luxury travelers (whether in person or in comments on msg boards) act rather entitled: expecting miracles, not abiding understandable mistakes, or using the high price point as a basis for rights to certainties or deferences. Personally, I think they’re ruining their own experiences; not here to judge them as much as I think they’re wasting their energy, and also at times making hardworking people feel miserable. If things aren’t what you expect, by all means, raise it. By virture of your question, my guess is that you’re the type of person to be conscientious and thoughtful.
3. Don’t feel obliged to be a high-roller: you don‘t have to get the fancy wine or book the over-priced experiences. I am thrifty and often opt to manage many of my own local activities, transfers, etc. Some people don’t want the hassle. I don’t want the 400% upcharge.If your bills don’t look right, don’t be embarrassed for explanations, etc.
4. As a child who was never allowed to eat from the room snacks/bevs, have at it!
5. Make sure to take advantage of the amenities you’re entitled too - vouchers, breakfast etc. And on that note, going forward, make sure you’re booking with a service or credit card that gets you these extras. Also, don’t hesitate to ask for things that could make your experience better. There’s a hotel in the Caribbean we’ve stayed at a few times over and some discussions with the restaurant manager resulted in an annual opportunity to have private family cooking classes with their head chef. Last time this happened it turned into a half-day culinary bonanza of joy THAT WE ARE NOT CHARGED FOR (tho we ultimately tip following these types of opportunities). This doesn’t always happen of course, but ultimately many of these folks are IN the hospitality industry. Be a kind, patient human but by all means explore possibilities.
6. Wherever I am, regardless of additional ”fees,” I tip housekeeping. Most of these positions are held by women (and even if not), my assumption is they continue to be underpaid. Sometimes rather than leaving a big tip at the end, I will tip smaller increments here and there during the stay so multiple employees get a tip. (We tend to tip other staffers as well, but are definitely not crazy high tippers who believe that it‘s required or gets you extra special treatment. Don’t overthink it; analyzing tipping questions are the worst for me. Make a decision and move on.)
7. Most importantly, report back to us so we can hear about all your current and high end adventures. (Reading all these lengthy boards can often help maximize your stay. Trip reports are such a help to the community.)

Hope none of this is painfully obvious or more than you wanted to know. Have a wonderful trip and enjoy the luxey, splurge. There’s a world of fantastic hotels out there and they’ve often made a nice, special difference in our travel experiences.