The group -- which included Chris Pine and Lie to Me actor Brendan Hines -- began their adventure on a huge tour bus. Throughout the week, the guys stopped at the Austin City Limits Festival in Texas, took a hot air balloon ride over New Mexico, and went kayaking and hiking through the Grand Canyon.
"We're going to make sure that everyone finds out about that long after it happens," Adams told ET in August. "That's kind of our game plan… but obviously we're both incredibly excited. Once it does, we'll make sure that the world knows."