If you have an Apple TV, Apple Watch works great as a remote. You can use the watch to play or pause a program, or scroll through the Apple TV menu.
To set it up, open the Remote app on your Apple Watch — you should see the option to "Add Device." Then, open up Settings on your Apple TV, hit General > Remotes and Devices, and select your Apple Watch. Once you enter the passcode on your watch, you should see a pairing icon.