oooh, very cool. i'm jealous, can't wait to go back. i'm also impressed. most american tourists stay in the south. few see sligo and donegal. my favorite area is just southwest of there, in leitrim, mayo and cavan. great fishing and horseback riding country. if you know of any fresh water fisherman (fly and spincast), take them on a tour thru ballinamore in co. leitrim.
northern ireland isn't as much fun because of the troubles, especially in the early summer. still, if you're into the politics and history of the north, a black cab tour is interesting. belfast is a very modern metorpolitan city, great shopping; and derry is also nice. good pubs and shopping. the northern coast road between the two is a beautiful drive, as well as the route thru the glen shane pass.
man, i can't wait to go back....