Two of my favorites are at Boat of Garten. No. 11 -- gently doglegging par 4, 379 yards, with a sharply sloping downhill tee shot. The dogleg starts right where most folks (presumably) want to land their tee shot, and simply "going over the top" of the dogleg is nearly impossible, given that you're standing in a forest of birch trees. From the tee, it looks like the thinnest sliver of fairway to hit, and you absolutely have to move the ball to stay in it. A very intimidating tee shot. The green, less than 30 yards deep, slopes off sharply on both sides, and there is a nifty little depression about 40 yards short of the green to catch underhit shots, which often occur, as the second shot requires one more club than you might think.
No. 15 -- a fun, fun straightaway par 4 of 307 yards. The decision about how to play has to be made on the tee. At about 170 yards from the tee, the fairway simply ends and falls into a deep (I mean deep -- 20-25 feet? The only comparison is standing at the bottom of Lawsonia's famed boxcar 7th) valley. The bottom of the valley, mowed as fairway, is 200 yards from the tee. To carry the valley is probably 230 yards, as the fairway opposite the valley slopes back into the crevice. The sensible play, probably, is short of the valley, but then you're left with a shot of 130-150 yards to a pretty small green (24 yards deep). You can bomb away, but risk getting stuck in the rough that leads in and out of the valley on the slopes (and it's a pretty narrow fairway, bringing the thousands of birch trees into play). You can play deliberately into the valley, and leave a simple shot of 100 yards of so, but you can't see a thing about where you're going, or where you shot goes (which I've always found makes a shot that much more difficult.) Some may criticize it as a 7 iron-7 iron hole (and it's a pretty logical way to play it), but it's a fun, sporty hole that offers several choices, and requires some thoughtful play. All without a bunker, water or OB.