Im assuming you are looking for semester 1 subjects?
I'd recommend GEOG10001 (pretty easy as long as you attend the tutorials), I think it counts as an elective for you not a breadth
If you are looking for an easy science breadth for semester 1 I'd recommend MULT10011 : earth, life and universe (its basically just year 10 science witha few more topics)
BTCH30002 is pretty easy too in terms of content, I'll post a review on that soon if you need more details (it is a biology-ish subject though so if you don't like biology don't do it)
Also if you are looking for any semester 2 subjects you should do SCIE20001 Thinking scientifically (Its a fully online subject, no contact hours and the assessment is relatively easy)