What a great idea. Make your own I SPY game with a VOSS water bottle. You fill it with rice and drop in little things to hide and then make a list of everything in the bottle for the kiddos to find. This is a great travel activity.
Great to encourage writing during the summer - Easy Homemade Books - with video tutorial for simple book binding stitch. Having a stack of these on hand encourages a lot of creative writing and drawing.