There are a lot of different activities you can do on holiday, whatever part of the world you might be visiting. If you are going to Africa especially, there will be lots of opportunities to see animals, to do various sports and to see some incredible landscapes that nowhere else in the world can compare to.
You may want to book some of the more popular activities before you go on holiday. Many tour operators around the world will now have a website that you can use to make your booking. The downside of this is that you might well be charged more to pay online using a card. However, it will secure your place on the various trips and activities so that you can concentrate on having the holiday of a lifetime. Of course, you can always book when you get to your destination as well, which may be considerably cheaper as different agencies will be in competition with each other.