Not a veteran, but I was so glad I brought a water canteen and planned on layered clothing. The mornings started out really cool, but by the afternoon, there was plenty of swimming and basking in the sun
Not bringing kids this year, but a sturdier carrier like a Kelty would have been useful. I got by w/ a Mei Tei, but it felt like a lot of hitching and arranging where the ring sling wasn't secure enough for trudging up and down hills and over bridges, etc.
Fruit and other snacks for in between meals was useful too.
Something handy to write your contact info on is helpful too as I met some incredible women - some of which I lost track of b/c I didn't have anything to give to them
I am bringing a journal this year so my notes and reflections will all be in the same place.