I have some issues with my feet when I do lots of walking (I have sunken arches)... So Disney... I have some sanuks that I absolutely love!! But with wear they get thin, and my heels pound more on the concrete. I have worn Birkenstocks (Gizeh) on my last 2 trips, and have no issues, even at the end of the trip!! So for me, that's amazing! The only Birkenstock issue is the leather sole and rain, which will stain your feet an orange-brown and then your shoes will hold in odour, which will cause issues when your shoes age. What I've started doing in carrying sanuks in the backpack I carry anyways, and swap them out when it rains! This works really well for me, and I never would have guessed that a solid cork soled shoe would be comfortable

As for wearing sanuks out, I also wouldn't take a brand new pair- I've gotten blisters from that past experience. I've become pretty particular about my shoe choices and stick to the ones that I know work! Good luck! My sister and I will be there around the same time, and we are getting super excited!