Just a few tips from my brother and parents recent trip:
* If you order a "latte", don't be surprised when you get milk. If you order a "Cafe Latte", you'll also get coffee included
* My brother could not get into the vatican, as he was wearing short (knee length) pants
* Pickpocketing is pretty chronic - mum had her wallet stolen on day one
Maybe similar to the Green Guide mentioned above - but I never visit a country without perusing the relevant Lonely Planet guide book - they are probably designed for the budget traveller/back packer but are full of useful travel info (accomodation, maps, bus/train info etc.)
... and Congrats on the upcoming nuptials
