Ok, here we go. Zeb's guide to the underground.
At Liverpool Street, when you get off the train, you walk across the station concourse into the entrance to the Underground - it's right in front of you. You can buy a 1 day travelcard for Zone 1 which allows you unlimited travel within central London from either a machine or one of the kiosks which normally has a huge long queue. I don't know how much it costs though - Ken has been mucking around with it all so much. Failing that, you buy an exhorbitantly expensive single ticket from Liverpool Street to Embankment using the Circle Line (that's the yellow one).
It will take around 20 minutes and you do not have to change at all. But remember the Golden Rule of the tube - you mustn't talk to anyone or look at anyone. They'll think you're a weirdo. So just stare vacantly into space and you'll fit right in
If you are staying at the Strand Palace (or simply if you want to get to the Strand), when you get to Embankment you turn left out of the ticket hall (away from the river) and walk up the short hill until you get to the main road (that's the Strand/Trafalgar Square). Charing Cross station is immediately on your left. MacD's is on your right. I think you should be able to see the theatre from there, but you can definitely see the hotel, both of which are on the other side of the road, as you look right.
We'll move on to directions for my favourite wine bars nearer the time - both of which are non-threatening, un-trendy, and very laid back. But you do pass one of them as you come up from Embankment, which is really really easy. hmmm, maybe that's why I like it