The fairway here is a little deceptive: it looks like a curve, but after bending around the obvious tree on the left, your disc still needs some forward glide to get all the way to the pin. So choose something that's not too fast, but can run down the left-angling lane. Too fast could run you into the trees beyond, but too far left gets you down into the nasty stuff. I throw a Buzzz or Comet rhbh here.

This beauty generally takes a firm drive aimed just about at the third tee so your (rhbh) fade can snug in toward the three guardian trees just in front of the basket. Trying to go straight at this one is deceptive, and could fade you left into the woods. We usually play tourneys with the road OB, so gauge the wind.

This shot goes significantly downhill to either the short basket position you can JUST see from the front of the tee, or to the long basket spot about ten feet past the footbridge in the gulley to the right. Please follow the advised mando to keep your shot left of the tree just in front of the tee: it keeps folks safe on the second tee.

Depending on the winds and the power of your throw, rhbh drives usually target a spot along the right side 'fairway' because going left allows far too much chance for fading down the hill to the pond.
The second tree out there is a thorny one, and I've managed to place my drive just under the low thorny branch here once. So better to stay right for shot #2 (where you'll likely repeat the process...unless you're one of those guys who are putting for two...500 feet out!)

There are two tees for #21, the first is to the left of, and visible from the #20 basket. The more challenging tee for #21 is uphill beside the building to your right.
From the long (upper) tee, you'll need a drive you can get safely around the corner of the building, but one that won't roll away downhill toward the pond. Follow that with an approach shot that gets you up the hill through the sparse trees for your par putt.
Oh, and par (3) here is doing well!

From the upper tee, #19 is best served by a well-shaped "S" drive (rhbh, which I've accomplished successfully once). From the low tee, you have a straighter line to the basket. Either way, choose a drive that will keep you out of the thick brush downhill to your right. The clump of trees up on the left side of the fairway is not a bad place to be, in comparison.

The basket can be a little hard to spot, but is directly across the ravine, about the same height as the tee, and finishes to the right in a small copse of trees. I generally throw something that I can turn to the right, late, and keep wishing to hear the chains.

My best tip ever: play this hole in the winter! Low foliage makes it SO much easier!
But seriously, it's usually necessary to take a low line drive straight down the narrow fairway here, because anything that gets up has a serious chance at clipping trees and shooting off downhill to the left. When the spring and summer growth is really going strong, that's a lost disc.
Better to go low and slow, and take a three, if that's what the course is offering.

Unless you really struggle to keep your drives under 100 meters (330'), this is a high reward, low risk shot. there's about 40-50' of clearing rolling gently downhill in all three directions past the basket. The only thing guarding against some rhbh drives is the tree on the right of the fairway if you throw too high. If you can't see the basket from the tee, they sometimes have the basket in the far right pin position, where a forehand or sweeping anny is needed for right handers.

The picture clearly shows a left side fairway and a right side lane that allows hyzer fade shots for all 'hands' to go for the pin. The landing zone is very forgiving: go short and fetch up against a set of logs in front of the pin for your birdie. A little long is generally safe enough, too.