According to the NHS, you should be up to date with all routine vaccinations and get the specific travel vaccinations for the region in Kenya that you will be visiting.
Cholera remains a very real threat for travellers to Kenya. The NHS recommends visitors receive a cholera vaccination to reduce the risk of getting ill.
Malaria is considered very high risk in Kenya. Make sure to protect yourself by taking antimalarial medication before, during, and shortly after your tip. You should also take preventative steps to prevent getting mosquito bites.
Dengue fever and chikungunya are also very common in Kenya. Be sure to use mosquito repellent, wear clothing that covers your skin, and use mosquito nets.