Dave,
Did the trip with my girl a couple of weeks back and it was a blast! Haven't flown a lighty in a while so I hired a warrior from minovation to keep things simple, they organised lifejackets and extra headsets too. Picked up a VTC from the chart place down the road and had a good read of the ERSA before heading off. Only thing i didn't know was not to call ready until you're front of the queue, which is quite long when jandakot is on one runway! Once you get going its all smooth sailing, the earlier you can get to Rotto the better, that way as soon as the sea breeze picks up you can head for home and watch all the boats pounding through the rough water! Even with the delays in getting airborne on a busy morning i think it took us about .8 tacho, all tolled was about 200 bucks incl. all the landing fees
Don't forget the snorkelling gear and sunscreen!
