Hello, welcome back! This isn't very technical information, but something I think will help you get around.
"The Grounds" has become a hub for all player activity. Roleplay advertisements, fun pop-up rps of anime/video game characters, and a lot of the same things that used to happen in Bonfire and Ascension Island! The "portal" area of The Grounds as it's called is a sort of new Stone Bridge. People come to advertise and look for rp groups. Of course, these people are scattered around all of The Grounds making movies, but a large majority are at the portal.
Ficho Tunnels is quite empty most of the time, unfortunately. It is however quite fun to explore! You never know what you may find.
Eastern Pass and Cherika Valley are the two most common locations for rp groups to camp. With the recent addition of Kibou Ridge, there may also be a few rps that are more arctic based there.
This is not by any means an extensive list, just a few hotspots to be aware of. I highly encourage you to explore and find your favorite place! It's all very beautifully detailed, you won't want to miss it. ^^