How much time to spend in the following for site seeing?

Hi all, I'm new to the board. I'm hoping to going travelling next year. I was just wondering how much time will i require to see some of the main cities siteseeing. I am hoping to stop at the following:

1) Adelaide
2) Melbourne
3) Canberra
4) Sydney
5) Brisbane
6) Cairns.

If you could recommend other places worth visiting in between these places as well. I'm going to be in Australia for two and a half months.

Thanks

Samantha

hi sammy

from adelaide i think 2 to 3 days for kangaroo island and 2 days for adelaide. from adelaide take a tour from adelaide to melbourne 2 nights 3 days looking around $350 including food and accom goes via great ocean road and grampians national park (my home town eh eh).
For melbourne i would stay 5 to 7 days lots to see around melbourne.
Then bus pass from melbourne to cairns mini traveller 45 day pass 1 direction.
stoping off in sydney for 5 to 7 days as well things to see bondi harbour bridge opera house blue mountains etc.
next stop if you want your dive licence coffs harbour 4 day course padi open water only $295 great value .
Then on to byron bay try a little surfing nimbin day trip 3 days there.
then on to surfers 2 days
brisbane australia zoo stev irwin zoo 2 days.
noosa good beaches chill out 2 days
fraser island if you do self drive safari takes 5 days
1770 if you want to ride little harley davidsons 2 nights (optional)
whitsundays 2 nights 3 days sailing around 74 islands 5 days
magnetic island 2 nights
mission beach sky dive water rafting 3 days chill out
cairns party 4 to 5 day
cape tribulation 2 day 1 night or 2 night 3 day includes accom and croc cruise
port douglas chill out markets on a sunday 2 nights
atherton table lands 2 days 1 night

thats around 2 months 1 week so u have a little time to spend longer in some places if you like and canberra for a night stop over if you want hope thats some help.
cheers stu live the dream