Mackay accom and things to do

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We are looking at going to a wedding next year which is in townsville but am finding flights $ with 2 adults, 1 child 1 infant. The sale fares never seem to be available dates we need.

We have now found tiger flights to Mackay and thought we could holiday in Mackay for a few days and hire car and drive to townsville (well actually Ayr) for a few days for wedding then drive back up a night in mackay and then fly home.

So wondering how long a drive it would be?
What to do in Mackay?
Where to stay thats family friendly and not OTT in cost.??

Thanks

ETA Hmm after reading more on tiger web page I dont think I want to fly them at all!!! Charge for pre selecting seats but if you dont they can't gurantee you are sitting with others in your party!! Check in 2 hrs prior recomended that means 0410 with 2 kids (nearly 3 and nearly 18 months)