How soon would we need to travel for our interstate wedding?

A question for those of you who are planning or have had interstate weddings....

Here's the background: My fiance and I currently live in Adelaide (SA) and wish to have our wedding in the Gold Coast (QLD), as this location is more convenient for the majority of our guests who are spread along the coast (from Bundaberg to Katoomba), as well as having special meaning for us.

How soon would we need to be up at the GC before our wedding day? One week? Two weeks? I ask only because we would need to organise flights and accommodation for that time leading up to the wedding, and we are trying to determine whether we have our bucks/hens up there as well (as opposed to making our guys and girls travel twice - once to Adelaide for the bucks/hens and again to the GC for the wedding). It would also be good to just do a final check on all the vendors/suppliers etc while we are there.

What did you end up doing, and was there anything you would have done differently if given the chance? Suggestions & ideas very welcome :)

Thanks for your help!