I googled to be honest and then played with the words to make it suit.
I can not remember what ours was but it said something like, you attending is our gift but should you wish to still purchase us something we would love a Myer voucher for such and such.....
As for no kids, I would just add a note saying as the venue is not suitable, please no kids.
Yep I agree with everyone else, do a gift registry at Myers and you can nominate your gift card amounts, then just note the registry # on the invites. For the children, we wrote 'Adults only reception but we can recommend some fantastic babysitters' but I was lucky enough to know a lot of girls through work who were able to babysit. Good luck - and as long as you prepare yourself for the fact that someone will always have a whinge about some aspect or another, but it's your day and you can do it exactly as you want
We didn't add kids names to the invites and if people wanted to know why kids weren't on there they could ask... we had told most people why we didn't want kids there though (ours was also by unfenced water)
As for the vouchers... i agree with all the PP. I googled poems for our invites.
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