RuneScape

Easy money:
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Go to Port Sarim, west of Draynor village, and ask one 
of the people in the blue uniforms to go to Karamja and 
pay them 30 GP. When you get there, walk off the dock 
and you should see a house. Enter the house and talk to 
a man named Luthas. He will ask you to pick bananas. 
Answer "Yes", pick bananas, put them in the crate, then 
talk to Luthas to collect your moderately earned 30 GP. 
If you would like more money in multiples of 30, ask him 
to get another 30 GP for doing the job again. Stay here 
for a long time if you need to spend several thousand on 
items.