I am visiting my son in Sydney, so he can keep his sanity I am taking a trip to Cairns to 3-7 days. I LOVE to snorkel, hiking. and just mellowing. I am solo, so any suggestions. Do day boats go to different parts of the reef so i could do several days, do i need to reserve ahead or do i just walk around at the port. any problem being solo. any hikes nearby, should i rent a car for a few days (I usually drive on the other side of the road) or can i just do an excursion to places? Best to stay in Cairns and use as a base or go to another town. I am a 57 year old male Canadian coming in July, have never been to Australia before.