Use your box cutter to carefully cut your pool noodle to the length you desire. If you prefer you can leave it whole.
Use your popsicle stick or stir stick to make holes in one end of the noodle. Push the stir stick all the way through on a north-south axis and then again on an east-west axis. Remove the stir sticks and set them aside.
Put your cork in the end of your pool noodle. Push it in and up past the holes you just created.
Put one stir stick back through the first set of holes you created.
Place a second stir stick through the other holes. This locks the cork in place and also serves as a stand for the sprinkler.
Use another stir stick or a toothpick or a skewer to put holes in the noodle. You can make your holes in a straight line or in a random pattern.
Attach your noodle to a water source and let the wet and cool fun begin. Here I am attaching to a sink in my warehouse, but of course you would want to connect it to a hose in your backyard.