Originally Posted by
robyng
Since we found taxis in Paris to be rare birds - we spent plenty of time both on the Metro and on buses. Each has its advantages/disadvantages. Apart from the obvious (under the ground versus out in the sun) - I would say it is easy to navigate the Metro if you know how to read a map - but it's good to have specific advice about bus routes in advance if you plan to use them (we got our information about them from the hotel concierge). Robyn
I agree. The bus map posted on Paris bus shelters (at least where it hasn't been vandalized) is great--but they don't (as far as I could ever figure out) make it in a format they can give out. The only bus maps that you can get in a brochure format are not useful except as general guides, since they're not detailed enough.
I think the OP is in a bit of a hurry to get from CDG to GdeL, and I would guess that RER B to RER A is probably the fastest (by far) way to do so.