Welcome to the CB. Fun things, well you can chat, go to the arcade and play silly games, you can create a photo album to share with us, or even a private one just for you. You can join a user group, so your name tuens a lovely colour!
Go to your user cp, you will see it on the left side of your screen in the pink tool bar that runs across the top of the page. Click on it and it will take you to your own page where you can do many things including join user groups. GO explore.