Heavy compound lifts like deadlifts, pullups, rows, curls will hit wrists, among a lot of other muscles. If that's not enough, you can follow up and blast them with farmer's walk, wrist roll, and hanging from an overhead bar.
Basically picking up heavy stuff, and holding some of it up for a long time. I wouldn't go crazy with a bunch of exercises right off the bat, see how your wrists hold up first. Cause you gotta save them to flog the dolphin!