I travel solo most of the time and I usually am very paranoid when it comes to handling my money specially since most of the 2 or 3 star properties that I usually stay in does not have a safe inside the rooms (well, some). So whenever I travel, apart from not putting my money in one place I do some tricks such as this one when we were in Lefkada (our hotel didn’t have a safe):
It doesn’t matter if you’re a smoker or not, just buy a cheap pack of cigarettes, take away half of what’s inside and put some of your money inside and in that case, I’ve included our room key card. When I traveled by myself to London, I had some of my money inside a sanitary pad – unused of course. Lol.