Since you have Clark be in his drifter stage, you can just as well assume that he works as a rafting tour guide for the summer (or whatever season). He might even wear his hair long and maybe sport a beard, accentuating his drifter status.
The tricky part would be why Lois is on such a trip. Your best bet would be to have her there because of a story.
Suggestions:
1) Lois has heard about some strange rescues / a forest fire that inexplicably stopped burning or anything else related to Clarks 'stunts'.
2) Maybe someone is playing Robin Hood in the area, relieving the (usually rich clientele of the rafting tours) of their valuables or even do some kidnapping? Even Clark might be new to the post because his predecessor has previously been kidnapped, too.
Just a thought for this second scenario: If you really want to complicate matters, you have Lois already engaged to Luthor. So, she might be there (officially) as the future Mrs. Luthor in order to attract the thugs' attention. Of course, with Lois being pregnant, her engagement to Luthor will be null and void. He would never accept to raise a child not his own.
In each of these scenarios, Lois would be rather unhappy about the rafting itself, but we all know she would go to any lenghts for a story. Being her usual competitive self, she would feel that she had to prove herself to the rest of her group, especially if this tour was full of competitions. What if they announced (and celebrated) the winner(s) of the day each evening or some such?
