Kiera and I went to the Okinawa Wonder Museum. For a couple of dollars to get in, the price couldn't be beat.
We learned about magnets,

mirrors,

funnels,

visual perception,

and had fun playing around with these beads.

I loved going to science museums when I was little (and still do). It was a little difficult learning with the language barrier and because everything was written in kanji, but I tried my best to explain everything to Kiera from what I know and remember from school. Play doesn't require language and it was fun anyway. It was a good day (and a great break from the blazing sun).