Here are pics of the garden. Ducks were hanging out in their pen, so Hazel Chicken was happy to walk around the garden for size LOL
Ducks are kept in small pens all the time, so probably still plenty of space for 3 ducks. My ducks don't really bother the center raised beds. But they root around in the short perimeter beds (from inside and outside the garden). If I have newly sprouted plants, I don't let them in and I keep them planted further from the fence to keep duck bills away. If I do let them in with young plants, I am in there with them to shoo them out of where they shouldn't be.
As far as temperament...
Runners - I have 3 currently. 1 from my original batch and the other 2 are from the 2nd batch. First batch of ducklets had a really sweet silver runner. She was beautiful and very friendly. She was the leader of the pack. Then she died :( Then I had 2 runners left. The flightiest one decided she was now the leader (and is the one currently left). The other runner from that batch was reasonably friendly as well.
They would all eat out of my hand with no issues and hang out near me and follow me around.
I then added 3 more ducks (2 runners and a welsh harlequin). The 2 new runners were flighty as all get out. One will only now eat out of my hand (they are 3.5 years old now). The other pooped all over me when I picked her up to bring her inside to look at an issue she had recently. These 2 pretty much always keep their distance from me.
But I love runners. They are fun to watch.
The Welsh Harlequin
She's funny to watch too, especially when she runs to keep up with the runners LOL
She's happy to be near me when I have food for her, otherwise, she keeps her distance. She was raised with the 2 crazy runners.
Batch 1 of ducks I was home all the time and spent lots of time with them
Batch 2 I was working, so they didn't have me around all the time and I think that had a lot to do with how friendly they are.
Both breeds will happily forage in the yard, but when they've had enough, they run to their pen for some food and then back out again to root around for more goodies in the ground,
My WH is a good size larger than the runners. I told DH the other day a Pekin would seem like an elephant in comparison to the runners.
My girls are chatty when they want something. Cadbury will run up the deck stairs and knock at the back door to let me know if they are out food. If they are out of food, the neighborhood knows. They all went through a phase where they were really chatty in their first year, but after that, they chatter, but they aren't loud and if they do get loud, it lasts a couple of minutes and then they quite back down.