Obviously pig beach was the main map, but since every map I try seems to be empty the spawn isn't great plus that dreaded iron hog is on every single one. I tried the map right of henesys (the hill east of henesys?) which also had a slow spawn rate. If anyone could point me to a reasonable spot that would be great, otherwise I'll just wait until the US players are about, as I guess it might be busier then.
Sadly, the best Pig map in the game is on Maple Island. The Forest East of Henesys (next to Nautilus) isn't bad, though.