OUTDOOR ACTIVITIES?

Hello everyone!
In my few years teaching experience, I've never worked with children.
Now, the coordinator of a summer camp asked me to hold English classes twice a week, 2 hours each class, to two different groups of children aged 7-10 (A) and 11-13 (B), of about 15 children each. I guess there must be a big difference of teaching method for each group.
Taking in consideration the environment of a summer camp, I need to involve all the children with games, songs and lively activities, but I'm a bit short of ideas...
I thought of organizing each lesson by topic, focusing more on vocabulary and less on grammar.
I'm trying to brainstorm on games, but little comes to my mind, a part from something like "Simon says", "Capture the Flag", "Bingo"...
I' m finding nice and happy songs on the internet, but they look suitable just for the youngest ones.

The summer camp lasts 12 weeks, for each one a topic: personal information, colors, numbers, clothes, animals, food, jobs, family, physical description, body, daily routine, city & transports?, countries & nationalities?

Is there anything that comes to your mind to relate with these topics and each group?

For the physical description, I'm thinking of a way to play "Guess who?", with different difficulty level for the 2 groups.
For the body, a good song, for sure, is "head, shoulders, knees and toes"
For the colors, i was thinking of changing Simon says in Simon sees something... yellow! and all the children should run to touch something yellow, kicking out who doesn't reach the right object...

Ah! maybe, I forgot to say something very important: I'm not English and during the time I lived in England I had nothing to do with children and their wonderful world, unfortunately!!!

So... any suggestion will be more than welcome!!! ...really, anything!!!

thanks in advance!