Between Noosa, Airlie Beach and Cairns, you have a fair amount of 'beach' time - not sure why you're

In Noosa, stay somewhere on Hastings Street, maybe the Sheraton or the Sebel or rent an apartment (some of which are beach front). Have lunch at Bistro C, dinner at Lindonis and Sails, amongst other places.
Between Noosa, Airlie Beach and Cairns, you have a fair amount of 'beach' time - not sure why you're fairfield inn las vegas doing all three (though nice enough to do)? I wouldn't stay in Cairns - go to Palm Cove or Port Douglas, which appears to be what you're proposing.
Suggest that on your way to Cairns you turn inland at Innisfail and drive through the Atherton Tablelands. A night there will not be too much. If heading to Port Douglas or the Daintree then continue north on the inland route and return to Cairns via the coast.
we get to brisbane early the day so we were thinking of heading to the theme park, an hours drive for the day and then drive the 2 hours back to noosa. we do not plan to stay in brisbane as we want to do a one day fraser island tour and visit steve irwin zoo so that will take up our days i would think.
as for the si trip, i like your first idea melnq8, we get to chch about 3pm so would you recommend driving to somewhere that same day or stay overnight in chch? what we were thinking was 2 nights franz glacier, 1 night wanaka, 2 nights te anau and 3 nights queenstown.....we are open to all options and to fill the remaining fairfield inn las vegas days.