whirlwind blows the house down

okay not really but now that I have your attention. My 10 year old cousin arrived yesterday and he does NOT sit still. If you can get him to stay in one room for more than 5 minutes then you're doing well. We had planned to take him to an amusement park today to get all that whirly energy out but of course the clouds have decided to open up and pour their contents out on Vancouver so we won't be going anywhere today. WHAT DO WE DO! if we have to try and house him inside our house for a day there won't be any house left but what do you do with a ten year old boy if you can't take him outside? My family is out of ideas so if anyone has any let me know. He's supposed to be here for a week and it's supposed to rain almost every day! HELP!