The first level of Toejam & Earl seems pretty straightforward, right? Just a small island in the middle of an endless sea to get you introduced to the game, right?
But, say you progress far enough into the game that you get something that lets you travel across the surface of the water, like Icarus Wings
Then you could brave the endless expanse of water and travel Southwest until you make landfall
The island has a couple of presents on it, which is nice, but it also has a hole in it. So you obviously want to jump in
And when you do, you're greeted with a tiny island with a Lemonade Stand, a Hot Tub, and a Hula Dancer
For a nice, relaxing time, and a health refill.
And as a bonus, once you're done here, when you jump off the island you're transported back to the highest level you got to on your adventure. Extra bonus!