Wherever you are currently hunting always works
Qeynos, near bank - to turn in gnoll scrolls and sell ports out
EC Tunnel
Lower Guk safe hall - to exp there or sell ports out
Lost Temple of Cazic Thule on top of Archon pyramid - to group for exp and sell ports out
Overthere Outpost, possibly on top of the wall - so you can go in to port people or go out to exp (have bat wings or lev cloak)
Outside Kaesora - to exp in there or sell binds and ports (you can bind others in the entrance hall to Kaesora, aka the <Azrael> guild bind
On top of Karnor’s Castle
Outside Old Sebilis
Firiona Vie if using it as a home base
Cobalt Scar at the click-in to Skyshrine so you can Gate and click as a quick escape/reset button when quadding in CS
Outside ToV for raids and to offer ports
Plane of Mischief