I used to be pretty bored on Sabbath too. Here are a few suggestions...
1. If you have some siblings or friends around, you can play Bible games, like Bible Pictionary, Bible Hangman, and be inventive and make up Sabbath games of your own to play!
2. You can do something like Bible charades OR my favorite: pick a story from the Bible, and act it out with friends! But not like a play...kind of like house! For example, you could be Noah building the Ark while your sons, Shem, Ham, and Japheth gather wood to make a fire for dinner (or something like that). I don't know, that may sound dumb, but I'm a teenager, and it sounds fun to me.
3. If you're on your own, you could read, draw, watch a Bible movie, or come on this site that we're on right now and hang out here!
Where Christian kids have fun! GuideMagazine.org is a ministry of Guide magazine, a Christian story magazine for children published by the Seventh-day Adventist Church. Guide publishes nonfiction stories that show children ages 10-14 how to walk with God now and forever.