The golden rule of coming ashore is that its better to be a foot too far away a hundred times, than a foot too close once and break boat or jetty. The thing to do is to use the "no go area" to slow the boat down by sailing directly into the wind with sails flapping. You then judge it so that you stop just short of the jetty - an inch is ideal, 6 inches is fine. Because the No go zone is roughly a quarter of a circle, you can always get the boat alongside without the sails filling by letting the sheets go.
Start by working out which way the wind is blowing. Remember that this direction may not be the same as it was when you launched the boat - the wind can shift! So look at wind indicators (other boats, flags) and assess how you need to approach for landing.
Jetty Facing into the Wind: Wind blowing onto the Shore.
Wind blowing along the Shore, Jetty at a right angle to the Wind.
Help, its all going Wrong!
Well, it happens to all of us from time to time. Sailboats have no brakes. Well, actually they do, there are a variety of ways of slowing down a boat in a hurry.
Its all happening to quickly, I'm going to hit something. You can slow down by pushing the sail out to act as a brake. This works very well if you are sailing upwind, is OK on a reach, and makes no difference at all if you are running. In fact all maneuvers near the shore are more difficult if you are running, so avoid doing so if remotely possible.
OK, that hasn't come off - what else - the shore is coming closer rapidly. Time for emergency measures. Whip the centreboard and rudder up before they hit the bottom: they are particularly likely to be damaged and need repairs. Now jump out. Get out of the windward side and hold onto the shrouds, or toe-straps or something convenient in a boat like a Laser or Topper with a freestanding mast. You should be able to hold it up, and your feet will touch the bottom before the hull bashes the edge. And even if you are out of your depth you soon won't be.
I'm going too fast for that to make any difference. Capsize. Stops the boat practically dead every time. Better to bash the metal mast than the plastic or wood hull.