Just returned from a week long trip to Long Lake. Fishing was successful enough to keep us happy but not as productive as my last trip there (3 years ago and many times before that as well.)
Here's my report: (We fished the North end of the lake exclusively.)
Lots of luck catching big gills & decent perch using a crawler/bobber combo fishing at about 5-6 foot deep in 8-10 ft of water. The times when I tried to shallow up resulted in lots of little ones. (Although towards the end of the week I saw several bluegill nests in the shallows- I assume they'll be spawning.)
Our group of 6 landed close to 35 walleyes in our week long trip- only 5 legals though. Encouraging, however to be catching all of those 12-14inch fish we were on. Four of the legals were 18-19 and the largest was 4lb 22 in-gorgeous fish. Fished them dragging a night crawler suspended a foot in 12-16ft water. Caught many of the smaller ones on a perch rapala (7-8 ft diver) which seemed to be attracting all species.
I did notice that we caught some nice smallmouth but lots of stunted largemouth- only one over fifteen inches out of maybe 50 of them.
Only two northern for the week but both very nice fish- one at 28 and the other at 25... thinking they're a little less active with the warmer water temps.
Overall advice would be to be adaptable in your methods- perch colored lures worked best for me while my usual favorites (black/silver shad and KVD strike king had no luck whatsoever.) Casting was working best in the early morning and evening (same with tight lining) while our bobbering worked best in the afternoon when the wind was calmer!