I used to always check out new waters by trolling a leach or a special carrie type of fly we tied up but since I've switched back to fishing out of a boat as opposed to a float tube and when fish finders became available I tend to buzz all over the lake as quickily as I can checking out structure, depth, and but mostly to find where the fish are. Then I just anchor up.
But don't get me wrong when all I did was fish from a tube back in the eighties and nineties my buds and I often had our best fishing moving about the lake. We'd fish two lines and alternate retrieving them in. Sometimes you'd hook up on the line you were retrieving while other times it was on the rod you weren't holding. Either way it was exciting!
Some of the best August fishing I've ever had during the summer doldrums was fishing lakes like Vinson or Jimmy (two of my favourite lakes back then) by trolling, doing the alternate retrieve thing, with 20 or 30' sink tip lines using a gomphus, a great late summer fly BTW. This trolling technique could only be done with a float tube because there was no way you could go slow enough in a rowed boat....and trust me, dead slow was the only way you could pick up fish using the gomphus. If you wanted to you could use a floating line with a chronie or a pheasant tail tied to it as your other rod because the speed was that slow. This technique saved our late summer fishing!