i was just exploring one day and found this..
First goto Orebar Harborage in Zangarmarsh, right by Maktu.
(coors for me are 41.5 , 27.3)
Follow the red arrow to the side of it, go down the hole you (should) see
go down there, look to the right and there should be a little patch of water, can't swim to far though, just a nice little spot to hang out at
ive only tried this with druid flight form, dont know about gryffons/wyverns.
and the town is alliance only.