If You Have Time

Hi, I'm going to Washington next month for half a month.
I'm really looking forward to visiting there so much.

※ "There so much" is an awkward phrase :/

I general "there" is implied by "visiting", so I would suggest the orange edit.

I have to transfer from to Washington, but until then I have much time:((

※ This sentence is a little out of context so it can mean more than one thing. Are you transferring from a Japanese school to a school in Washington? If so, then make the purple edit. Also, having to transfer has the connotation that you are forced to transfer.. I am not sure if that is the case, maybe use "I am transferring" instead.

If it is convenient, couldn’t you show me around?

※ Sorry I won't be there, but if it's Seattle let me know and I can recommend food and places.

Please let me tell know, if you could.
Thank you for reading my bad English:)

※ Very readable :)

I want you to correct my mistakes, in addition.