Hayseed - sounds like some great ideas there with the 2 rooms and kiddies club. I too haven't been to Coff's so I'm not much help there.
We've been on limited holidays with Gabby. We went to Echuca for 4 nights in late 2005 and had a great time. We stayed in a caravan park but in a self-contained cabin (yes.. I know.. not really a holiday because I still had to do dishes.. but we had financial restrictions so we had to be able to cook our own food etc.). We stayed with another family and they had the cabin next door. Gabby's portacot fit in the second room fine and it was handy for her to have her arvo naps in there without being woken by general noise.
There was a babysitting service there. I didn't use it but I thought it was a great idea if Neil and I wanted to go out for dinner or something on our own (making it a holiday for me too... as you said).
Good luck with planning your holiday and what a good idea for a thread!