Trying to think of all the spots I've stumbled into RP...
The Adventurers' Guilds in Ul'dah and Gridania are the most populous spots, though I've generally found the Quicksand is a little more popular. Haven't seen much RP elsewhere in Ul'dah, but in Gridania I've also stumbled into RP at Apkallu Falls. Limsa Lominsa RP seems to center more around the Bismarck than the Drowning Wench, for whatever reason- most likely due to aetheryte proximity. But I've also RPed and witnessed RP at the Wench- though it seemed a more popular location on Gilgamesh than it is on Balmung.
Outside of the cities, it's obviously a bit more sparse. I've had some luck at Camp Bronze Lake and Camp Drybone, for whatever reason. (Well, no, I think I can guess why Bronze Lake is a popular option, but it shouldn't deter non-ERPers!) I've bumped into RP at the village southeast of the Nanawa Mines in Central Thanalan and the Hermit's Hovel in Outer La Noscea as well. Typically, the best spots have an aetheryte but aren't a hub for FATE grinding, daily quests, or major plot content. I'd be hard-pressed to think of any RP at the Hawthorne Hut, Little Ala Mhigo, Revenant's Toll, Camp Dragonhead, Horizon, Quarrymill, or Costa Del Sol. Lower-level maps are more popular for a variety of reasons, so they're a good bet.
The Adventurers' Guilds in Ul'dah and Gridania are the most populous spots, though I've generally found the Quicksand is a little more popular. Haven't seen much RP elsewhere in Ul'dah, but in Gridania I've also stumbled into RP at Apkallu Falls. Limsa Lominsa RP seems to center more around the Bismarck than the Drowning Wench, for whatever reason- most likely due to aetheryte proximity. But I've also RPed and witnessed RP at the Wench- though it seemed a more popular location on Gilgamesh than it is on Balmung.
Outside of the cities, it's obviously a bit more sparse. I've had some luck at Camp Bronze Lake and Camp Drybone, for whatever reason. (Well, no, I think I can guess why Bronze Lake is a popular option, but it shouldn't deter non-ERPers!) I've bumped into RP at the village southeast of the Nanawa Mines in Central Thanalan and the Hermit's Hovel in Outer La Noscea as well. Typically, the best spots have an aetheryte but aren't a hub for FATE grinding, daily quests, or major plot content. I'd be hard-pressed to think of any RP at the Hawthorne Hut, Little Ala Mhigo, Revenant's Toll, Camp Dragonhead, Horizon, Quarrymill, or Costa Del Sol. Lower-level maps are more popular for a variety of reasons, so they're a good bet.