I've been visiting the Po Delta in northern Italy since 2003. For the last week, I was guiding a group of BirdLife Austria to this productive birdwatching destination again.
The thing that amazes me most about this region, besides the good birds, is the amazing number of birdwatching opportunities. There are plenty of walks and hides, some old and overgrown though. There must have been a time where the "Po Delta Regional Park" was heavily developed as a birding destination. But I didn't see any new hides and the site guide (the one with the Little Egret in front) is unfortunately very old. I found a new one here, which I used a lot this time. This PDF is apparently quite new, though it also lists very unproductive, disappointing sites (such as Canneviè) or sites with unusable hides (Valle Bertuzzi, eastern shore). Trip report coming soon!