I spent a few days combing the app selection for the Watch; here are the best ones (as of 4/29/15):
I’ve been combing through the Apple Watch app store’s 3,000+ entries to figure out which apps I want (and which ones other Watch wearers might need). To explore the App Store, you need to first download the Apple Watch app to your iPhone — it’s the same app you’ll use to pair the Watch up with your phone. Then you can search for apps just as you do on the desktop or an iDevice.