My niece and her husband will be traveling in October to Paris for 4 nights and 3 nights in Venice. She has been there before, this is his first time.
What would you recommend they do for the Paris to Venice transfer. Thank you

If money is not too much of a problem....
The Orient Express....

http://www.orient-express.com/web/vs...nt_express.jsp

Well, the options (if the quite wonderful looking Orient Express mentioned above isn't going to work...) are:

• Flight with Air France or Alitalia. There are no discount one-way fares, so you'd have to do a throwaway. It's a fairly bog-standard flying experience - rather like a domestic flight, as they're both Schengen.
• Flight with easyJet. It's one of the better budget carriers, and does fly to Venice proper, rather than Treviso. It'll be a little less pleasant than AF/AZ, but not significantly for this kind of difference. Plus, the money saved will easily pay for a boat transfer on the Venice side
• Artesia train journey. It's quite a distance, so it's best done overnight (unless you want to get the Artesia TGV to Milan and change). There are 2-person sleeper compartments. If you enjoy train travel, there's nothing quite like arriving in Sta Lucia station early in the morning, walking out and seeing the Grand Canal right in front of you.
• Train journey in stages. Unlikely to be a good option when time is limited, but you could have a nice couple of days on a TGV/Cisalpino route stopping over in Switzerland, with some rather stunning scenery, too.

Be sure to look out the window as the train approaches Venice. The final stretch, as the train crosses a causeway built in the lagoon, allows you to see the tower of San Marco. It's absolutely magical.

We did Easyjet Orly to Rome last September. Flight was fine and cost about €45.

thank you all for your suggestions, especially stut for all your options.
Orient Express is an option albeit very expensive.
I will let them decide.
Any comments on how to travel from Treviso to Venice?
My vote was a full day travel on the train but the night option is nice and I like the idea of waking up to see Venice in the morning.

Huh??? easyJet does not fly to Treviso. It flies from Paris-Charles de Gaulle to Venice Marco Polo. Ryanair flies from Paris Beauvais to Treviso one time a day. myair also flies from Paris-Orly to Venice Marco Polo. Having flown all airlines listed as well as Air France, AF is the best of the airlines for convenience. They have 7 flights a day. However, for value, easyJet and myair are both good. I just flew on myair from VCE to ORY and the flight was on-time, nice clean airplane, good legroom, friendly service. We took easyJet on the return and it was a madhouse at the airport. Not very organised. The flight was fine on a new A319. No complaints about the flight. Just easyJet's operations at CDG are just 2 degrees from hell.

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Umm, that's what I said: they do fly to Venice proper.

sorry, misread your posting.

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No probs, I think it's a question of idiom...

keisari, no need to get to/from Treviso, unless you particularly fancy Ryanair - I wouldn't recommend it. If you do, there'll be a connecting bus.

The one-day train trip is possible - changing in Milan or Turin, but it's a long, 11-hour haul. Again, though, you could split it and have a couple of hours for lunch somewhere in the Alps.