For 50 shillings (about .74c US) one-way, you can ride a rickety little boat across the river to get to the base of the falls. It was worth it, as it was quite fun to clamber over the rocks.
In the back of the Thika Falls resort, there is a craft village with about 10 stalls. Also there are a couple stalls at the entrance. Several shops within this complex have original art in the form of paintings or pencil drawings.
What to buy: Original art.
What to pay: Depends on the size and medium used. Bargain hard and you will get excellent prices.
On the north side of the main road thru Thika, the Del Monte shop offers fresh pineapple and a variety of juices.
What to buy: Grab an absolutely fresh dead-ripe pineapple for only 50 shillings. You won't believe how good it tastes!
This fellow had nice necklaces and bracelets made from natural things.
What to pay: About 100 to 200 shillings each. Bargain hard!
Be very careful if you try to cross the falls along the top. You'll have to take some pretty large leaps to make it across a few of the streams.
You will be approached by young men who will offer to be your "guides"...for a price of course. You don't need them! Stick to you guns, telling them you do not want or need guides and absolutely WILL NOT pay them a single shilling if they insist on following you. Even if you just arrived, tell them you have been around and are tired being guided when you don't want to be. After that, don't say another word to them no matter how much they try to engage you in conversation. They are NOT being friendly...they are con men. Don't fall for it.