There is a lot of interesting places and buildings to paint if you have time to wander around
http://milwaukeesketchclub.blogspot.com/2009/08/milwaukee-sketch-club-in-downtown.html
I didn't have time to wander, only an hour, so just painted the gazebo had an interesting play of light.
Tonight we are scheduled to go to Sail Loft. That's a great place. Last year they let us paint on their deck.
http://milwaukeesketchclub.blogspot.com/2013/07/milwaukee-sketch-club-at-sail-loft-on.html