One thing you might want to do this summer is join a virtual world. Then you could do it with your class during the school year. I suggest Moshi Monsters. "Guide the students in signing up for Moshi Monsters where students can apply knowledge of digital citizenship and etiquette as they navigate their adopted monsters in a well-monitored virtual world."
There is a free version. Of course if you want more you can pay $ for a subscription. From the parents' section. "We passionately believe that children learn best when they're having fun and this principle is right at the heart of Moshi Monsters. Children earn Rox (the in-game currency) by solving a wide range of fun daily puzzles with their Monster. These puzzles start simple but become increasingly challenging as the child's skills develop. The puzzles cover a wide range of skills including numeracy, logic, spatial awareness, geography, anagrams, and vocabulary."
Try it, you might like this on a rainy day!