Tea Series #4: Tigoni Waterfalls
The cache, a small cylindrical tablet camo-pot, is the 4th of the 10-cache Tea Series located in this picturesque and serene tea-producing area around Tigoni and Limuru about 45 minutes drive north-west of Nairobi.
It is hidden under bark pieces behind and at the foot of a tree about 1m above and on the upper (north) side of the broad trail leading down towards the beautiful secluded 18m (15m + 3m in 2 drops) waterfalls in the grounds of a small, old, farm inn at the end of a good 1km dirt track loop (navigable by all vehicles). The establishment sits on top of a 2,155m (7,070') ridge with wonderful panoramic views overlooking rolling fields of tea and on in the distance to Nairobi, 25km south-east and Ngong Hills 30km to the south.
Note: due to cloud cover at the time of placing the cache GPSr readings were only around 9m accuracy, so rely more on the description + hint which are adequate to enable location of the cache.
To access the cache:
Take the Limuru Road heading north past the Village Market mall as far as the Banana Hills road junction @ S 01 12.428 E 36 47.153. Turn off to the right (north) and follow this road up through the bustling Muchatha (2km from the junction) and Banana Hills (5km) areas emerging back out into the countryside, passing the Kentmere Club on your right (10km - and location of the cache GC3P914 Tea Series #2: Tigoni Time Warp) and on to the junction at All Saint's church signposted Limuru Girls School @ S 01 07.991 E 36 41.875 (after some 14.5km).
Turn right here on the tar road and proceed approx 1.5km to S 01 07.430 E 36 41.300 (just before Kiambethu Farm (on the left). Turn right here onto a dirt road which heads down and up past the school and then after a left hand bend loops around the top of the ridge along a jeep track to the Butt Farm / Waterfalls Inn gate. Pay the Kshs 300/person entry fee here and proceed to the parking area in front of the farmhouse.
From here, simply follow the signposted footpath east for approx 150m past the restaurant, across a grassy picnic area and then down a 
broad-stepped trail through the forest to the waterfall. The overgrown jeep track which you see ahead of you at the corner where you headed down to access the falls continues west through the lovely cool forest and loops up and around to the right to emerge in a grassy sloping field heading back up to the start (approx 550m/20 mins walking distance). This track is also navigable with a little care (narrow in places) by 4WD vehicles (and probably normal cars) and there is just enough space to do a nifty 5-7 point turn around where it meets the stepped foot trail coming down from the farm.
Update July 2015: the track is currently blocked by piles of logs and branches which have been cut (with permission) from the forest trees but not cleared away. However, it is still possible to make your way through the debris on foot - as I did when doing a maintenance visit.
The house was built around 1925 and was originally occupied by Sir Colin Campbell who was chairman of the Kenya Tea Board from 1961-1971. The farm dates from around 1960 and is now somewhat run down but still has a few cows and is inhabited by Mr Khalid Butt & his wife who kindly granted permission for the cache placement. I was told by him that there are another 3 waterfalls above the main falls which can also be accessed on foot . . . further exploration is obviously required! Do make a point of greeting the Butts - they will be delighted to have a chat about the farm and its history.
The falls are on the Rui Ruaka river which eventually joins the Nairobi river 28km south-east @ S 01 14.291 E 36 54.734 beyond Nairobi and south of Kasarani. This then joins the Athi river @ S 01 11.991 E 37 09.440 before it continues on and down to the Indian Ocean which it joins through a small delta about 5km north of Malindi.