well if your close enough like best friends and family its ok (well my family does it though...) to share food... but like its bad to do it by passing on food with chopsticks to chopstick if you get what im sayin... the reason is because there's this ceremony to people who passed away and it involves passing on something like a offering with chopsticks... also don't stab your chopsticks straight up on your food too... again the funeral ceremony kinda thing/offering to the dead...
Swimming caps are needed because in japan and some other asian countries have filters on their pools(for cleanness reasons) and so hair can get clogged up in it so yeah some pool require you to put on a swimming cap.
osaka is famous for takoyaki and okonomiyaki and theres alot of sight seeing. If you go to the Nara temple you can feed deers
they sell shikasenbe (deer crackers) and its really fun
Mochi is yummy but you always have to eat it with something because it has noooooo flavor but its good with alot of things like ozoni, or just toast it alittle (yakimochi) and put soysause on it (i prefer to add a little sugar on it
) , in winters you would mostly see oshiruko, which is redbean paste soup with mochi in it. but all ways be careful with mochi because you can choke on it easily because its verrrryyyy sticky and chewy. Have you seen the anime danshi koukousei no nichijou? because they did a joke on choking on mochi... Also if go to any asian store they mostly have mochi and mochi rice (you have to clean it, steam it, and then pound it until its like dough adding water softens it alittle but don't add tooo much) you can also buy mochi icecream (the icecream has mochi around it) but some people don't like mochi's consistency and some brands have a different consistency too... like recently my family couldn't get japanese brand mochi rice, so we tried this korean one and it was pretty good
. Theres also this powder sweet mochi which you just add water and microwave it to make sweet mochi, my mom usually uses it for ichigo daifuku the inside has a strawberry and anko in it (my american friends didn't like how mushi it was so they didn't like it but my chinese friend loved it lol)