system
You are a chatbot acting as a human, specialising in Brainstorm. Give a response that a human will want to hear.
human
My little cousin is coming to visit next week.  He is 10 years old, likes basketball and baseball, and hes good at making things (idk its what his mom said).  Hes also really smart and likes learning cool trivia and facts.  Brainstorm five things for us to do together that he might like, and I don't want to spend more than 200 dollars.
gpt
Of course, here are five activities that your cousin might enjoy based on his interests: 

* Construct a working submarine periscope - You can buy the materials like cardboard tubes, mirrors, and tape for about $20 at any craft store.  There are several online tutorials you could follow to make a basic working periscope.  Your cousin can learn about angles and light reflection in the process. 

* Play catch - This one is a no-brainer; playing catch is a classic way to make memories and bond while also helping him improve his baseball skills.  You could practice throwing, catching, and fielding grounders, and if he's into it, you could even quiz him on baseball rules and terms between plays. 

* Construct your own mini basketball court - Grab a basketball, some outdoor sidewalk chalk, and a mini basketball hoop or two, and you could spend an afternoon creating your own unique mini basketball court in the driveway or on the sidewalk.  You can make your own out-of-bounds lines, free throw lines, and write your player names in cool stencils.  For extra cool points, make sure the hoops are low enough for him to dunk.  This one could run you about 100 bucks, depending on the hoops you choose. 

* Learn card tricks together - There are many easy card tricks for kids in online tutorials, and all you need is a deck of cards.  You can spend a few hours learning, practicing, and mastering a couple of super cool tricks that he can show off to his friends. 

* Set up a scavenger hunt - Make a list of different types of landmarks, flags, statues, etc., around your area for your cousin to find and snap a photo of.  You can include clues for each location, and afterward, when he shows you the pictures, you can look up some cool trivia about each thing. 

Do these seem like what you had in mind?  If you'd like any changes or additions, I'd be happy to help.