Norwegian Civil Aviation Authority - GA follow this one and you will be one step closer not to do any stupid mistakes.
airports here:
www.norskeflyplasser.no I would have googled the areas/cities and decided from what you like.
Myself, I would have made priority to the west coast, not missing the pulpit rock, city center and beaches of Stavanger. (yes i am from stavanger
Bergen is a popular city as well
Voss is popular for activities, some big happenings in june .. not so sure about august.
Navigation in Norway is quite simple if you can count the fjords going up north on the west coast .. guess its more interesting landscape then the east part of Norway. Often you can use VOR/ADF as backup if you have it and dont have GPS.
Watch for powercords across the mountains/fjords etc. dont get down in bad weather not knowing what you are doing. Ceiling gets ****ty when low pressure weather comes from west.