I wish I knew some Spanish, but at least I know a little bit of Japanese.
Kyo wa ee tenki desune = Today's a beautiful day
Watashi wa Nihongo tabemono ga suki desu = I like Japanese food
Are wa uchi ni kare imasu ka = Have you returned home yet?
Oh dear. None of that is completely correct...
In the first sentence the meaning is "today is a nice day isn't it?" Literally it's today is good weather isn't it?
Beautiful would be kirei na or utsukushii
Nihongo 日本語 means Japanese language... Not just "Japanese"
The last sentance... Are is for something away from te speaker or listener and only refers to nouns as in objects. It would be unbelievably rude to call someone "are" in Japanese. Japanese does have a few pronouns, but almost always it is more polite and thus proper to say their name and attach a title if necessary... Even with friends.
Uchi is for ones own home.. Not another's
And the verb you are trying to use is kaeru, which means to return home.. You have to conjugate that though
I'm a Japanese major and studied abroad with a host family for a year (none of whom spoke English. It is my duty to correct you! Haha, good job though. Japanese is difficult though! Especially for English speakers cuz thesentence structure is all