Yups... Try to catch the bugs on the palm tree.. They worth more bells.. The best is you can chop off the fruit tree and just left the ring of palm tree to increase the chances of the bugs appear on the palm tree..One trip can make about 300k...

You can actually get around 300-400k per visit from Island.
There is a method of making the island botak and only big bugs will show up if you want to know