Start here: http://www.kdwpt.state.ks.us/news/Hunti
All the state and federal refuges here are different. Some allow boats, some areas require mudmotors, some will accept outboards, some don't allow power of any kind, some don't allow boats at all. The all have different "closure" policies; they can close hunting without notice. The above link will help you get information on each refuge. Very, very few WHA's (Walk-in Hunting Area) have any waterfowl habitat. The link will get you a map of the WHA's.
Time of the year will also determine which areas are best...or even which area's are open; Kansas has four distinct zones, each with different season dates.
The largest refuge, acre-wise, is Cheyenne Bottoms. This year it had some of the fewest opportunities, since drought prevented putting water on 3/4 of the hunting area and on 1/3 of the refuge pool area. We only got to hunt two of the smallest pools of the five pools on the refuge. Next year isn't looking any better, water-wise. Some of the refuges in the central and western parts of the state were completely dry. Many of the areas in the eastern half of the state had all the water they needed. So, you see, where to go depends on many factors, factors that are quite variable. Weather is one of the big ones; we can be frozen solid in 2-3 days if the conditions are right. We can also be UN-frozen in the same amount of time. Do your homework the weeks just before you leave.
Often wrong, never in doubt...