That subtle hint is actually a mouthful. Lakes talk all day, including when silent. They're constantly telling you something useful.
Based on your post, the most useful I thought of is having a full sink line for starters. Something in the traditional type 4 or 5 range (fast side of middle sink rate without being a deep diver). One of the most popular ways to struggle in lakes is to be too high up, thinking a floater and sink tip or hovering line will cover enough depth. You don't need to go much beyond 10 feet or so, I never do, but putting your fly down even a few feet effectively takes more than people realize.
Searching - assuming the lake isn't saying much, I know the shoreline and general trolling out in the open are popular. But if you can, find a shoal or expanse of 0-10 ft depth and look around a while. Nothing tricky, just put it down below halfway best you can. Trolling still ok, or do a cast-count-retrieve. A few minutes of that usually tells you how active or not the lake probably is.
Final tip. Again assuming it's slow, I always tell myself, "the deader it is now the aliver it's gonna be later." And sometimes later is minutes away.
Have a blast down there. Think its been 20 years for me, but that area is a favorite.