mearepaige
Senior Member
For me it has been catching beetles and fish on the island at night. I'd love some new suggestions and ideas that I haven't tried yet 

Catching bugs is really entertaining (not just the beetles at night, bugs in general) and fishing is really nice. I'm starting to get into turnips, which really pays off in a few weeks.
Selling all the junk I've accumulated in my closet.
Not because it's particularly profitable, or even convenient, but it's just such a huge relief to finally get rid of all that stuff and see some space in my closet. Best bells I've ever made.
I love collecting fruit and shells even though it is a slow way of money it is fun!!!
But the bugs and fish at night are the fastest!!