Rafiki's Planet Watch isn't really a "land" and not really an attraction either. Our best guess is that Disney is using the name as an umbrella for Conservation Station, the petting zoo, and the environmental exhibits accessible from Harambe via the Wildlife Express Train. Presumably, Disney hopes that invoking Rafiki (a beloved character from The Lion King) will stimulate guests to make the effort to check out things in this far-flung outpost of the park.