Out of curiosity is there a reason why some locations are set for multiple players and others for the solo player?
The reason for asking is that as a primarily solo player if I go by the locations listed I will only experience the same three. If it is just a case of there are eight locations I might consider just shuffling three of the eight to get my locations, so that I can experience different ones.
The game developers said somewhere that the locations used for multiple players tend to be the harder ones. You'll notice that some of the later locations for the earlier scenarios start showing up as single player locations for the later scenarios, as characters get better, and scenarios get harder.
The Mountain Peak would be devastating for a single character, for example.