Colder nights have brought better fishing depending on the species you want to target.
White bass - There is still a school on the rock wall but the best fishing still is from the Rat River south into Lake Poygan. Purple/Red and Red flies with a minnow is best when they are not feeding. If you see the water moving, it is white bass feeding and throw a rattle trap or demon spinner. It is a lot faster because the feeding doesnt last all day.
Walleye - Eater size walleye(13-1 are very active. Darker jigs with half a crawler or a minnow on the bottom has been the best method. Red Banks down through Fremont has produced several limits as well as the mouth going into Poygan.
Panfish - Some good numbers and good size gills are being caught on just a worm and bobber. Location is more the key. Look for mouth of the bays, especially ones with weed growth. You will get a bonus perch but you will need to weed through a lot of smaller fish to get a legal one.
Crappie - Target the trees with deep water near by. The magic depth is 5-8 ft depending on the tree with some being as deep as 10 ft. Small jigs tipped with minnows are still the best presentation though plastics can work.
Bass - The smallie fishing has been great but I would recommend targeting for numbers further north. From Gills to New London. Tube jigs and rattle traps can produce a really exciting day.
Stop on in while the weather is still warm.