Hi Georgie,
What type of things do you like doing? I have not actually been to Kenya so cant give you any advice there but I have been to Gambia and loved it!!!!!!
One thing I loved doing and definitely advise looking into is holiday with a heart. I spent a day volunteering in one of their people projects and loved it! Was an amazing experience and am continuing supporting their sustainable fundraising projects.
What part of gambia are you going to? If you let me know the time of thing you like doing while on holiday/travelling I'll try and give you some more tips

Hope this helped a bit though
Lexie