120K is alot of money.Due to my religious inclination...I wont advise you to open a pub.....Infact I encourage people to stop drinking.....
But ....here are some Ideas for you....
1.Start small business in one of Nairobis slums.Eg cooking Mandazis and supplying them in Kiosks, shops and supermarkets in the slum. I know A guy who started so and now he has a car.He infact started with less than 20K.
2.With decentralisation about to happen due to the new constitution Start a business e.g selling plastic utensils, basins , buckets etc in upcountry trading centre.
establish a good relationship with suppliers and you will get credit terms with them in due course.
3.If you are a man start Buying cattle cows ,sheep & goats and selling then during market days.
4.Get a stall in Gikomba Market and start a second hand cloth business.
5.Buy a blender (2-3K) start selling Juice in densely populated areas such as slums .Combine with a popcorn machine about 20k Juakali model.
6.Get connection in slums ....look for someone selling a plot there be careful not to be conned.....build mabati houses and you become a landlord......No sweat though risky.
120k ni nyingi sana if you are a hustler .All the best .
There are so many ideas .
Isaiah 65:17-Look! I am creating new heavens and a new earth, and no one will even think about the old ones anymore