Where do Johnny and Ponyboy go when they leave the park?

I assume that you are asking about what happens in Chaptr
4.  In that chapter, Johnny and Pony have gone to the park separately to avoid
situations at home.  They find each other there are are about to leave when the Socs
jump them.  Johnny ends up killing Bob Sheldon.

After that,
the two of them are kind of panicked about what is going to happen to them.  They leave
the park to go find Dallas Winston.  They think Dally will have a plan to get them out
of trouble.  He is at the house of a friend, Buck Merrill.