It would have been super easy to get all the tickets and reservations (the latter for Milan - Venice only) at once at the Geneva airport railway station counter.
If you will get a cheaper Geneva - Milan ticket (I suppose for the 16.47 train) you will have to book it in the net. The whole Geneva airport - Venice journey will then cost 93 EUR instead of 95 EUR.
10
neckervd
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Lonely Planet
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