Bushwalk Australia

we want to take our parents (in their 60s) on their first ever overnight walk and are looking for suggestions for easy (i.e. not too steep or rough) walks ideally within 200km of townsville or cairns.

any ideas?

thanks

Goldfield trail? FNQ is all about steep and rough, someone who has knowledge of the misty mountains may be able to suggest a walk there.
http://www.nprsr.qld.gov.au/parks/wooroonooran-goldfield/about.html