It would be rather unusual to enter the traffic pattern as you've described in the first scenario. The last is way more likely- you'd be doing some sort of approach, in which case you'd land straight in.
In the rare event that you'd have to circle, the terrain would play a more important role in deciding left or right traffic.
Last edited by Check Airman; 5th Oct 2018 at 13:59.
Reason: Spelling