There really is no spot on Cherokee where a boat and dog are not necessary for a successful hunt. Yeah you might be able to knock down the occasional duck that flies the shoreline, but retrieving that downed duck without a dog or boat on Cherokee is near impossible...8+ feet of muck and weeds that will give even a determined Lab trouble swimming through...You might want to try Lake Kegonsa at Fish Camp Park, you can walk the shoreline(good solid ground and not too deep) all the way to what I call "Sh*t Creek" and there are plenty of decent spots there. Also there are a few spots near Gov. Nelson State Park, one on Oncken Road right across the street that from Gov. Nelson SP that you can walk back into the river/creek and get some good Woodie action early in the season...Theres also a good public walk in spot off of Woodland Drive heading towards Waunakee that if you wander around back there you will find a good sized pond and a winding river/creek that I've killed many mallards and woodies out of.
I've been hunting the Madison area since I was just a young whipper snapper so feel free to PM if you wanna bounce some ideas off me, chances are I've atleast tried every public walk in spot in the Madison area.
PS. Another great walk in spot is in Sauk City on the WI River, the Lower Wisconsin Riverway Park I believe is where you go to park your truck and walk in...But there you better get there early, lots of other yahoos.
If you're too busy to go duck hunting, then you're too busy!