Here we Kayak the river and dive for lost golf balls near some water holes on a golf course. We actually almost get hit by some flying golf balls and find several fresh ones! :)
We find many Titleist Pro V1's and other nice golf balls like the Taylormade TP5X, Callaway Chrome, and Bridgestone.
There is a market for reselling golf balls and this could be a good business for kids and it is a fun hobby. You can resell golf balls for $1 to $2 dollars for some of the nicer brand names.
We use two inflatable Kayaks, the Sea Eagle and Intex Explorer K2.
Some things to take along when looking for golf balls are nice polarized glasses to see in the water, some mesh bags, a golf ball retriever and even a snorkel and goggles would be very helpful.
We also find a nice old vintage Rolling Rock beer bottle, catch some Smallmouth Bass and see many crayfish.