Quick! Desert island. You can only have one toy (or kinky implement, or if you're extra good I'll let you have a piece of bondage furniture/large equipment). I know, I'm panicking already. But go on, what is it?
(Assume there's someone there to enjoy the toy with you if it's not designed for solo use.)
I have the same problem. I think okay, I'm a sadomasochist, so something for pain, definitely. But you can cut a switch from a tree. I might say restraints because the improvised alternative would hurt my (or my partner's) fucking wrists.