whats the best thing to do in Iwakuni Japan?

Question

Its a small Place with a bunch of rules.

Answer 1

eat japanese food,watch japanese t.v. and sneak out with married japanese men

Answer 2

There are a number of places close by for sightseeing.
Iwakuni is famous for its bridge, plus small castle there:

https://www.youtube.com/watch?v=0COOZXi66mM

There is not much else close by, although Hiroshima is not that far and Miyajima is one of Japan's most treasured sights.