What indicates that Chris intended his Alaska trip to be his final great adventure?

Chris tells Westerberg that he will return there in the fall to help on the grain elevator again, and Westerberg gets the sense that his Alaska trip will be his last big adventure before he settles down, at least comparatively.

McCand-less promised to come back to South Dakota in time to help with the autumn harvest, but he wanted to be in
Fairbanks by the end of April in order to squeeze in as much time as possible up North before his return.