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Both Jesse and Celine are very wide eyed and think that a lot of great stuff is going to happen to them.

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I didn't get this impression at all. Especially from Jesse. I know he just got dumped by his gf in Spain, and has reason to be upset after flying over to be with her, but he seemed more bitter and for deeper reasons than that scenario would justify.

His reaction to to the poet (he probably uses the same poem with everyone and just plugs in the key word), the palm reader (she only tells you things you want to hear), the waiter on the train (service is too slow - although this may have been a slam on American impatience and the I want instant gratifacation syndrome as it was rehashed later by another American couple in a restaraunt)... these things and probably some others I just don't now recall, led me to believe Jesse was a sceptical, untrusting, pessimistic character who is going to lead a very lonely life.

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I don't think your examples really make a person cynic. He is sceptical, but not entirely pessimistic. It could be that on just those three subjects he has deep ingrained beliefs by the way he was raised. I am usually wide-eyed about life, but there are things where I am very sceptical, like things like palm-reading or people that see ghotsts and stuff. I don't think saying that palm-readers say what you want to hear gives any information on you. Saying that you believe in palm-readers would give a lot of information but not the other way around.
With the impatience, that could just be, as you mentioned, american impatience with service.

The one about the poet is the only one that seems pessimistic, but just one example, doesn't give much. Every person in the world has its contradictions, you can be very optimistic about most things but pessimistic about some.

I agree with pryor's view as realistic different from pessimistic.