Wake to the last used app
By default your Apple Watch will show your selected watch face when you raise it up. Over the last two weeks, I've found it much more useful to have my last used app appear, especially when used while working out.
Force touch to clear all
If you have several notifications appear at the top of your Apple Watch, save yourself some time and force touch to then be able to clear them all.
Ping your iPhone
Access the quick settings glance and then ping your iPhone if you can't find it. You will have to be connected, but the ping noise is loud and clear.
Cover to mute
If your Apple Watch lights up during a meeting or a movie, simply place your hand over the watch face to have things muted.
Pay attention to taptic engine while navigating
The Apple Watch is excellent for navigating, especially when walking around the city.
For a left turn, you'll get a series of two taps, played three times: tap-tap — tap-tap — tap-tap. For a right turn, you'll get a steady beat of 12 taps: tap-tap-tap-tap-tap-tap-tap-tap-tap-tap-tap-tap. You'll also get a long vibration when you're on your last leg of the journey, and when you arrive at your destination.
Launch Siri in a couple ways
You can raise your Apple Watch or press and hold the digital crown to launch Siri.
Control your iPhone camera remotely
If you are trying to capture photos without making it obvious, remember that you can use your Apple Watch to remotely control the camera app.
Look in Passbook to pay for things
While there are dedicated Starbucks, Alaska Airlines, and other apps, you may need to open and use Passbook to actually pay for your coffee or flash your boarding pass.
Run without your iPhone
Take a week to run with your iPhone connected to your Apple Watch in order for the calibration to get setup.
After a few runs, go ahead and try running without your iPhone and you may just be surprised by the results.
Double press digital crown to toggle between watch face and last app
As I wrote about in my full Apple Watch review, there are multiple ways to interact with your Apple Watch.
Double press in on the digital crown to toggle between the watch face and your last used app.