I would say it depends on what you want to see and do. Having travelled there for a long time (6 months), it is hard to do it in a short time because of travel distance and time required.should i go to australia for 2 weeks in april? is 2 weeks even enough time?
oh, i just can't make a decision to save my life. i don't know if it's worth the expense and travel time.
Alternatively, you may want to take a look at New Zealand. Beautiful place which shares a lot of geographical similarities but on a much smaller scale. You could do something like the south island in 2 full weeks.