How To Pass Time Waiting For Replies?

Normally I am not very social but I have been talking to my friends a lot lately. But my best friend’s internet plays up a lot so she can’t reply to emails and she lost her mobile (thankfully though I can talk to her on her home phone). My other friend has a family computer and he is not allowed to use it too often or for very long or his parents rage, and I don’t have his phone number.
What are some things to do while I wait for replies? (it can take up to a week or two sometimes)