Coolum area - particularly Perigian beach is lovely and very family friendly. Great beaches, a nice little shopping centre with a small grocery shop, bakery, butchers, bottelo, a couple of takeaway shops and close to all the attractions and bigger shopping centres.

I've stayed here http://www.stayz.com.au/52229 it's just devine. A two story unit with two double rooms upstairs and laundry/bathroom, kitchen and lounge down. It has a great deck over looking the ocean and sitting out there having brekky was devine. It's in a quiet area, though the road below gets noisy in the mornings and evenings with commuting traffic.

There is a food spot a short walk away near the beach, and a small shopping complex within 5 min drive with food/bakery, etc. Noosa is 10 mins up the road and Perigian about 5 in the other direction, Coolum about 10-15mins drive.