Jace was on wall patrol duty, not that he minded. He was just glad he didn't need to use his earth abilities to build anymore walls or forts. It was draining to an entirely other level, though to be fair, when his life was on the line, and so was everyone else's, exhaustion was a small price to pay for security.
Still, he was savoring this opportunity to rest, and raise his cultivation at the same time. So while patrol duty might have sounded boring to anyone else, the contrast of doing patrol with the knowledge that something out there wasn't actively hunting him and everyone else made the experience much more enjoyable.
The air was clear, the sunlight refreshing, the views great, the company even better. What more could a guy ask for?