Here is what I think I know:
People restrict their rounds at Bandon for one of two reasons: time or money. If it is due to time, play four different courses. You can go seaside Four and skip Trails. You are going to play two courses by one architect, no matter what. C & C have two of the five, as does Tom Doak, so you can't come up with a four unique architects package.
I think that Bandon Trails is the most unique course of the five, as it has no ocean views, but it has everything that you could ever want in a course. However, I think that it is the most difficult of the five. I could never ask someone to skip Pacific Dunes; it is one of the most important courses to come along in my lifetime, and I am 55. That would leave you with Sheep Ranch, Old MacDonald, and Bandon Dunes. Old Mac offers template holes/hole interpretations that are often discussed on this site. Bandon Dunes is the first course at the resort, and Sheep Ranch is the last one.
My verdict for this scenario? Skip Sheep Ranch.
If it comes down to money, and you are up for it, try to do the three-in-one-day and play Bandon Dunes (full price) Pacific Dunes (half price) and Sheep Ranch (free) in the same day. Those are your three easiest walks. Old Mac and Trails are tough and fun walks.
Good luck. PM me if you have questions.