The Expo floor is massive. Really massive. I have been to the RSA Conference 3 times and it while that show is big, it is tiny compared to HIMSS11.
I attempted to print the floor plan from the conference website (pdf), but even spanned across 15 pages (11x17 paper in a 3x5 grid), I couldn't read the names on the small booths.
So I decided to crop down the floor plan to just the bare essentials (I don't really need the location of the dumpsters) and was able to make a usable printed map. I ended up with 8 11x17 pages that I had to tape together, but at least I can read it...
Give it a shot. (Please leave me a comment if this is helpful to you.)
Here is the cropped floor plan.
You will need a printer that can print 11x17.
Make sure and set your paper size to 11x17.
You should also set the 'Page Handling' Like this: