I'm going to Kobe / Osaka, Japan at the end of July. All ye gaze upon my (lack of)plans


For all those who have been there, had good times, and left broke but not broken, what/where are the must dos and must bes?
I haven't purchased airfare quite yet either though I'm about at the end of my rope in looking for the best flight, which I've found to cost $1000 (into Tokyo) or $1100-1200 (into Osaka, obviouisly prefered). Anybody use particularly savvy travel agents?
The Umeda District will be owned, hopefully mostly by me. Hinoya et al. will see my ugly mug and trap my tourist $$$$, but I'm wondering if the two days I spend there is enough for shopping and maybe a little sight seeing (Osaka castle??) in Japan's second largest metro? Also, food. Tell me where I should eat after doing these hot 'n' heavy (21oz!) days Japan's kitchen.
Finally, anybody been to or know anything spellbinding to do in Kobe? Planning a sake brewery stumble 'n' hop as I hear it's known for it. Should I rent a bike in either city? Help me!