Challenging 2 day trips around Sydney

Hi all,
A friend and I are looking to do a two day trip in the next fortnight. We're both physically fit, in our 20s and enjoy a physical challenge, but we have limited navigation experience (she has a lot of camping experience). We're hoping to find a walk that's physically challenging, but with a trail that's easy to follow so we can work on our map-and-compass skills and work up to harder walks. I picked up a copy of Bushwalks in the Sydney Region vol. 1 with the intention of going to Kanangra-Boyd, because my father took me on 2- or 3-day trips there a lot as a youngster. But after considering the weather and my limited experience with navigation I decided for something slightly easier (KB can wait until later in the year).
We'd love recommendations for walks that fit the description given above within a 2 or 3 hour radius of Sydney.
Thanks,
Charlie
A friend and I are looking to do a two day trip in the next fortnight. We're both physically fit, in our 20s and enjoy a physical challenge, but we have limited navigation experience (she has a lot of camping experience). We're hoping to find a walk that's physically challenging, but with a trail that's easy to follow so we can work on our map-and-compass skills and work up to harder walks. I picked up a copy of Bushwalks in the Sydney Region vol. 1 with the intention of going to Kanangra-Boyd, because my father took me on 2- or 3-day trips there a lot as a youngster. But after considering the weather and my limited experience with navigation I decided for something slightly easier (KB can wait until later in the year).
We'd love recommendations for walks that fit the description given above within a 2 or 3 hour radius of Sydney.
Thanks,
Charlie