Other Attractions in Osaka:
1) Shitenno-ji Temple
2) Osaka Culturarium at Tempozan
3) National Bunraku Theatre
4) Osaka Aquarium Kaiyukan
5) Minoo Park
6) Universal Studios Japan
Other side trips from Kyoto:
1) Mount Koya: Mount Koya is the center of Shingon Buddhism and one of the holiest places in Japan. It is also great for experiencing a night at a temple.
2) Kinosaki: Kinosaki is a charming hot spring town about 2.5 hours north of Kyoto along the coast of the Sea of Japan. It has an old fashioned hot spring town.
So if you're looking at your list of places to visit in Japan, particularly in the Kansai Region, definitely add all this short trips to your itinerary.
I heard and read that Kyoto is very pretty when its full bloom. And so that is my cue to say: We're definitely coming back to see :)