What a good idea! I'd make sure that everyone got enough (but not too much) sleep as well. I'd also get everyone to make suggestions for exercise so we all did something we really liked (and perhaps tried something new or something we thought we didn't like).
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if they are to small to massage, you can try to let them walk on your back. It's an oriental thing: you lay on the floor on your stomach, and the small child walks on your back.
This is nice. My sister (aged about 3) used to do it with Mum. I (aged about 12) used to lean gently on her back in the right place with my foot. It seemed to make all the difference to her.
Have a great time!