Travel. Due to infertility, we did actually do a lot of travel (Egypt and Morocco were trips we did during this time). I regret at our honeymoon we didn’t go to South America. We spent three weeks in Mexico and then DH got a great job offer so we went back to the UK (we are not from the U.K.)
we had children ‘later’ and subsequently had a decent deposit to buy a house once we decided what country to live in. So if possible, I’d say buy a house. perhaps have a pension. You’ll probably never have so much money again!
Get into a system of organising online photos... this has definitely passed me by, not helped by changing technology since having my first dc 13 years ago.
Enjoy eating out and doing nice things. When you can’t do them anymore, or it all seems like such an effort, you’ll be glad you’ve already done it. Due to not returning to our home country, we have had no family support and now have 4 dc, two with ASD. We do I it all on our own. Threads about GP not helping out with childcare truly surprise me!
Oh, have a degree or ‘something to fall back on’ work wise. As above, things never turn out the way you intend. Due to disabilities, losing a child, changing what we planned in life, I didn’t work for a long time and have fallen back on something. It fits in well with our lives, which are largely dominated by supporting our dc. Having spent a long time travelling and doing things I like, I don’t regret/begrudge anything.