I went to uni in Glasgow and did various (camping and sofa surfing) trips around Scotland. Here are my recommendations (in no particular order):
-Anstruther
-Aviemore
-Oban
-Skye
-Glasgow
Unless you have a burning desire, I would avoid Edinburgh to be honest. Touristy, expensive. Glasgow is the real city and recently voted top European destination for 2016 or something to that effect.