'Boy in a boat" reef out on the end (southern) of the Hillary's marina is not a bad little jaunt if you're fairly new to scuba. You have to carry your tanks and gear out to the rocks then it's about a 35 - 40m swim out to the reef which is a big roundish reef bout 60 - 70m dia from 0m - 4 or 5m depth.

If you have a 4wd and know your way about you could go up to Eglington rocks 200m south of the Alkimoss wreck but it would be a fair swim out.

Busselton jetty is a nice easy dive with some interesting colour at night and you can make a day trip out of it. Easy night dive for newbies.

Fork out some dollars and get on a charter. Although I wouldn't touch them, Mindarie is cheap.