Edit 2016: as per a comment below, it seems as though apple picking is no longer available. If you know of any other apple picking options in the hills, please share in the comment section.
During April, May and June you can pick your own apples on Hollidays Road, Summertown. Easiest way to get there is straight up Greenhill Road and left onto Hollidays Road. It’s also possible to go to Crafers up the South East Freeway and turn left on the road which goes past the Botanic Gardens.
It is open 11am to 5pm on Saturdays and Sundays, and Public Holiday Mondays. Apples are around $1.20 for varieties such as Granny Smith (cooking apples, etc) and around $2.20 for Pink Ladies. The trees are fantastic, loaded with fruit and very tasty. There are a few varieties available. They have a blackboard up with prices.
Here are some of the pictures I took today: