Ducks like having a POND source.. like an old hard plastic swimming pool.. They aren't as friendly as chickens. They love slugs. You can use an old Dog house.. as they do not ROOST like chickens. .but do need a nesting area for eggs. They are funny and goofy but I've found chickens have more personality.
Oh good to know about the pond situation... Prob not a good idea yet then because I'm sure my toddlers would be jumping in with the ducks.