Ponies and humans have been happily writing letters back and forth for as long as anyone can remember - it's great fun! Neither can visit the other though, sadly. Just the rules, sorry!
Well, at least until Puddlejumper - cleverclogs that she is - figures out a way of visiting her human penpal Ben for fun, japes and general good-timesitude.
Only not. Because it does not work out like that.