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7.Is Ryouga ever shown anywhere outside of Japan and China? my 

opinion is

that he always get's lost in the zoo...

Definitely not.  That is fanfic legend and just plain stupid (to show
Ryouga in the USA, or on Dune, or whatever.  Of course, for comedic
effect such a scene could be useful and it has been used in a number
of early fanfics for exactly that purpose, but along the way it's
become accepted as the norm.

In the first episode where Ryoga shows up and is talking about the 4 
days it took him to get to the fight, in the anime didn't it show a clip 
of him going past the eifle tower in paris?

Okay. I'm only going to say this one more time.

Ryoga has only been confirmed in the manga and anime as going to the
following places:

1) Japan - nearly everywhere in Japan, in fact. 

That 'Eiffel Tower' is in fact the Tokyo Tower, which is a very good copy
of the Eiffel Tower. You don't believe me? Do a search, or watch the
following anime: Tenchi in Love!, X, and Magical Knight Rayearth.

The 'Hawaii' people think Ryoga went to is in fact Okinawa - a place he
visits in the anime, but not in the manga. The anime trip to Okinawa is in
fact, a little illogical. He is shown collapsing on the seashore in human
form, but this is already after he falls in the spring of drowned piglet,
so logically, he should be in pig form. One of those filler things
carelessly added by the anime screenplay writers that the continuity
editors probably didn't spot.

2) China - He's been to Jusenkyo, hasn't he?

Also, for more confirmation, he follows (along with Ranma and Co.) Akane
and the Shichi Fukujin to Nekonron, China in the first movie.

3) Russia - that's the Kremlin, ain't it?

Ryoga is very briefly shown wandering in Moscow. This happens in Vol. 38 in
ONE PANEL in the manga, and also very briefly as a passing background in
the anime, in the first episode of the Bakusaitenketsu episode (Breaking
Point).

Any other place he's ASSUMED to have gone to is a fanfic canon thing. He's
never actually confirmed in the series to have gone to those places when
they're shown in the anime. It's only for comedic effect whenever Ryoga is
portrayed as the Japanese equivalent of the Wandering Jew.

Well. That's that.
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