I currently live in Queensland, Australia however i used to live in California. I am planning to stay the whole summer (around 90 days) under the Visa waiver program from around May 17, 2017 until August 10, 2017. I have perviously lived in California for seven years (2005-2012) and plan to go back and live just how i used to, seeing all my old friends and just generally living like a local again. I plan to stay with friends for the first month then rent out a room by myself for the other two months.
My main concern is whether or not the CBP officer at port of entry will grant me the full three months. I will not be doing any tourist activities and a vast network of friends and activities will keep me busy the whole time. Is there anything i can do to show the CBP officer that i will be returning home on time and ensure that he or she will grant me the whole three months.