Mine just love their bath, but as you have a pond maybe they don't need another one. They jump into buckets, sheep drinkers, washing up bowls, their dog bath, anything wet with nice fresh water in.
Ours don't actually eat much shrubby stuff but they do like to spend part of the day hidden away in bushy bits. They also like somewhere they can sunbathe.
But most of all as you know they love to graze. Maybe you could close off some areas to allow the grass to grow a bit when the warmer weather starts, so they could have a rotation of longer grass, say 2-3", or you could sprout large trays of grain for them.