There are plenty of options

• Tropical Fruit Farming - build on the existing orchards
• Nursery - grow tropical plants and medicinal herbs
• Bamboo - cultivate bamboo as an excellent source for textile fibre and sustainable building material
• Permaculture - fertile land and plenty of water  
• Health Tourism - perfectly suited for guests who are sensitive to noise, air pollution and chemicals
• Yoga Retreats - the atmosphere is peaceful & serene
• School Camps - plenty of space for bonfires and adventure
• Wilderness Camping - an alternative for people who don't like to be tent-to-tent
• And many more - what is your idea?