Where is the furthest you have ever gone without using a plane?

[Meaty]

Lancashire England to France

[zabadak]

London to Lucerne, Switzerland

[Richard1978]

Lancashire England to France

I had two family holidays in France where were drove there & back, using a ferry because the Channel Tunnel wasn't yet open.

[darren]

Northern ireland to dublin to holyhead to manchester to cairnryan to belfast by ferry.

Did it bout a month ago

[Cartimand]

Just come back from a cruise from Southampton to the Norwegian fjords and back.
North Sea was pretty rough (the shipping forecast did say gale force 9 to very strong storm force 10, and my wife felt seasick.
If we'd been flying though, I guess turbulence might have been just as bad (but not as long lasting).