Before operating from Omarama, read the AIP page for the airfield.
The aerotow operation at Omarama is not an all day every day operation. You will need to ensure towing is going to be available before you show up.
Aerotow retrieves are only available by arrangement.
The winch operation at Omarama is not an all day every day operation. You will need to ensure launching is available before you show up.
To operate from Omarama you need to have flight following in place. It is recommended to carry a satellite based tracker, like a Spot or inReach. You need to have a person on the ground who is responsible for monitoring your flight and who is familiar with the SAR and emergency procedures.
The Omarama Gliding Club operates by arrangement. If you need a briefing or a sign off from an instructor, you will need to arrange this in advance.
Pilots who come to Omarama often want to fly in the wave, and with wave often comes strong conditions on the ground. If the local pilots don't want to grid their gliders, perhaps you should reconsider getting a launch. Remember, the launch doesn't procede without a towplane, so talk to the towpilot before gridding on a wild day. They may decide not to tow.
It is not unusual on a wave day for the wave to dump over the end of the runway. This causes the towplane to stop climbing as you fly through the sink (and turbulence). You need to be ready for this and understand that the towplane isn't having a problem and will climb once you get far enough into wind to get clear of the sink. Aborting the tow at this stage will put you at low altitude over rough terrain in strong sink, best to abort before you leave the airfield if things are really bad.
When landing on a wave day it is not unusual to get strong lift and sink in circuit. Keep your circuit tight and high. Use your airbrakes to manage height rather than extending your circuit.
If the wind is strong, carry plenty of speed but not too much. When you get close to the ground you want to slow down and stop as quickly as you can.
In crosswinds you can land on the diagonal rather than along the runway. This will reduce to crosswind component. In a southerly crossind you can approach over the rough, touch down on the northern edge of the runway, roll across the runway with over one hundred meters of width and the option to turn along the runway if you need more room. In a northerly crosswind the southern edge of the runway has fences, trees, and buildings so it is more difficult to get a good diagonal approach.
When it is very gusty I use the center of the runway as my aiming point. This puts me as far as possible from any potential obstacles. Typically my base leg is close to the runway end so my entire final is above runway. Once I'm in the flair I use full brake to kill the float and get firmly on the ground, using wheel brake to kill the ground roll. It doesn't matter where on the runway you are when you do this. Just get it on the ground as cleanly as possible. Trying to float the glider up the runway to get close to the hangars on a gusty wave day is asking for trouble. So is trying to taxi clear. Keep the glider as straight as possible and move it after it's safe on the ground. Don't forget to clear the runway as soon as possible after landing so the glider behind you has room as well.