It would be really useful to have a 'return to course page' option in the calendar view. If, when in a course, you click on Calendar in the global navigation, you are taken to the Calendar View. From there, there's no direct way back to the course you were viewing before, except for hitting the back arrow in the browser. This is because you are taken to the general calendar page, with the course in question being selected in the list of courses there.
One option would be to link the course URL to the course name in the list on the right hand side of the Calendar view to have a direct path back.