First and foremost, of course, the main structure throughout the movie(s): The Pride Rock.
Includes the ridge to the rock's left, leading up to the top area of the structure.
Inside the main den (Added a dead wildebeest for post-hunt roleplays:
The rocky area the 'bath scene' of the first movie takes place in - In this version of the map, it is on the rocks to the right of the summit itself.
The entrance to the Lion Guard's Lair (Just in case you guys wanted to roleplay that)..
..And the inside of it
Scar's Den (Had to wing this one, pretty much includes a first 'floor' for the confrontation scene with Mufasa and a second one for the 'it's our little secret' scene).
Rafiki's Tree (Mesh credits at the end of this post)
Rhino Chase Hills (Yes, from the one scene in TLK2)
The Wildebeest Herd & Hyena Hiding Spot:
Inside Mufasa's Gorge:
The cliffs and thorns through which Simba escaped:
The pond Kiara ditches Timon and Pumbaa in prior to meeting Kovu:
The Pride Lands and Outlands border:
Zira's Gorge and the Battle Grounds:
The Water Hole