well I was hoping for someone els to post as they know where it is but they haven't
thats actily strange
If you were meaning me - I was out all night (it's called a social life :P)
I know where *one* stronghold is - which I've mentioned to people several times - the entrance to get to it is in a cobblestone hut just outside the communal use farm (the farm is built over my old quarry site, which uncovered the wall of a stronghold), but I've never gone in there, so I don't know if it has and end portal or not.
There is another one I know of, which does have the end portal and I've been through it to have a look - but I went there by tp'ing to someone else, and he went there by co-ords - which I don't know....
So someone will either have to checkout the stronghold I found, and see if that has an end portal, or find out how to get to the other one (I think Dewey, Nastafar and Akira know where it is)