Thanks to Marisa for the following, nothing too spoilerly.
LikaNui
Huuuuge filming late yesterday afternoon in the area near Heeia Kea harbor. A ton of trucks and star trailers in the lot at that maintenance yard where the remains of the plane are covered with the tarp.
Didn't have my camera with me. Sorry.
pzarquon
They've been out there all week, mostly filming at night. Fans visiting from afar (New York and Spain!) have stopped by, even met members of the cast, but the magic is happening deep inside the jungle and security is understandably tight.
Source: Hawaii Threads