Agriculture is one of the most important sector of the economy. It is widely known and used.
Agriculture is also business and it creates job opportunities. Most people don't like to engage in agriculture because it's stressful and etc........

Agriculture consists of all ranges of agricultural produce, selling of these produce brings a large amount of income depending on what you sell.
Selling of commodity products brings higher income like palm produce, Cocoa , Docanuts, kolanuts brings income.
Engage in agricultural business.

Tourism and travel is very entertaining, knowledgeable, to some very boring, while to some it's educative.
Tourism yields income through visiting interested sites to learn more about an idea. It also gives inspirations.
Tourism relaxes your mind and gives you fresh feeling. Also get to know about new places, religion and their beliefs, about cultures...

Tourism is a centre of attraction and thus yields income through write ups about history and experiences, it does sell.