When you have a land for investment make it profitable instead of leaving it idle for many years. Trees would be the best answer for that. Plant the land with fruit trees that will start to yield harvest in 5 years. You can also plant lumber trees like mahogany that you can sell the wood after 10 years of growing. Another kind of tree that you can plant is bamboo which you can sell the bamboo poles. Here, one bamboo pole costs 1 dollar which is big money if you will have a lot of bamboo groves. If you are in a tropical country another good money maker for an idle land is coconut plantation.