My in-laws specifically gave us a $100 gift card which covered a great dinner at Sanaa. My mom got us bride and groom ears beforehand - and it's honestly really nice to hear people just saying congratulations as you're walking around. It just makes it feel special (I always make sure to congratulate others or say happy birthday if they're wearing a pin). The CM's were just so nice to us too - it was really a special trip. I'm not sure how it is with COVID and I've known others on their honeymoon that didn't receive any pixie dust, but I kid you not we did not pay for a single starbucks coffee or dole whip the whole time we were there. A CM in Gaston's Tavern gave us a souvenir mug for our lefou's brew, and a CM in animal kingdom literally chased us across a bridge to give us each a mickey pretzel. Granted we're always really nice to CM's and strike up conversations with them whenever we can, so I think our attitude probably got us some pixie dust - but if your DD and her future spouse go for it, I had lots of fun with us matching. I got us "just married" buttons from etsy before we went, and had us matching most days - we wore those hubby/wifey disney shirts and I got us both lion king shirts from kohls for example. It was just lots of fun to be totally cheesy.
Definitely look at the special tours Disney does that are open now, depending on your budget and how long they'll be there. I've only done Behind the Seeds. We had Keys to the Kingdom booked for our last trip, but that was when COVID happened and it got cancelled.
If Disney is still doing in and they have time, they should totally do a DVC tour. It was a cool few hours. Again, pre-COVID, but they picked us up from our resort, took us to SS for a presentation, and afterwards we got ice cream/3 fast passes/a gift card each - which we definitely immediately emptied out at the Food and Wine festival. They also drove us to where we were going next (dropped us right off at AK).
But I hope they have the best trip ever! Our Disneymoon was definitely our best Disney trip.