Tough choice! I've done Europe twice (well parts of it!) and Canada once. Canada was lovely and friendly and relaxing. We didn't stress about language or signs or culture stuff. The scenery and outdoors are great.

But Europe is amazing too. If you decide to go Europe, I'd highly reccomend an author called Rick Steves - he writes guide books, which are kinda like lonely planet books, but heaps better! My DH planned an amazing 6 week trip based on his advice and tips. See if you can get them from a library and then photocopy parts to take with you. It's like having a guide tell you the history and little facts along the way. Personally, a contiki tour isn't for me. We've always done it on our own.