I will be arriving Chubu on 31/05, will go to Osaka on the same day, stay 5 days 4 nights. My itinerary in Osaka basically cover Namba, Shinseikai (Tennoji), Abeno, Umeda (Floating Garden & Tenjinbashi), Kaiyukan Aquarium. I have bought the JR West Rail Pass, is this pass can be used for all the area I mention above? Is it very complicated to find the correct train to get around wif my JR pass as I know there are a lots of train operators in Japan. I know I can get the answer in Hyperdia, but I'm not sure the station name for each of the places that I'm planning to go in Osaka. Also, with the JR pass, is it necessary to get the Icoca Card again?
After Osaka, I'll be heading to Kyoto using the JR pass again. From Kyoto how do I buy the Shinkansen ticket to back to Nagoya?
Lastly, what is the weather kind during 31/05-07/06? Consider hot or windy or rainy season?
Thanks in advance.