South Twin Park looks like a great place to play in Amery! There is a sandy beach on South Twin Lake. There is no life guard on duty, so watch closely. There is a large, covered picnic area and a building with showers (and I would assume toilets?).
I see plenty of space to run around. The park is listed as having a playground, but that looks to consist of a few swings and maybe a see-saw.
South Twin Park
W Elm Street & Water Avenue ~ Amery, WI