Do you have a library or post office or anything at all nearby that you could walk to with your son? It's still a bit cold out in some places but if there was somewhere to walk to, it might make a difference. I use to walk the half mile to my post office and mail all my mail there instead of putting it for the mail carrier to take. I even got to mailing myself fun postcards everday. I'd write a little quotation or affirmation or something :-) If you have even just a mailbox at the corner, that can be a good walk, think of an elderly aunt somewhere you can write or something and do the walk to the mailbox to mail it.