The difficulty does not include the way to Tanzania itself but from Parking.
You have not to enter the Arusha National Park itself, but you should!
Not at least because of this view of Kilimanjaro.
While your Driver-Guide is doing the paperwork you can find this little Add-On.
Find the cache under a stone a few meters from the parking area directly behind a tree on a new Round-Trail.
Avoid any contact to animals. There can be dangerous animals around. You go on your own risk.