I actively avoid carrying cash around with me on a vacation. I bring enough for tips and only keep in my wallet if it's a day where I'll need to be tipping like a travel/transfer day. The rest stays in the safe along with a back up credit card and a zero balance gift card. That way, if I lose my wallet on the go, I can just transfer the gift card balance, cancel that credit card, and still have money access the rest of my trip.