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You need to go and see the Sainte Chapelle - it's right in the middle of the Palais de Justice on the Ile de la Cite, but it is absolutely exquisite. We went there on MN advice and were gobsmacked. The ante-chapel is beautiful - and then you realise you are not even in the main chapel, which is upstairs....
If you buy a Paris Museum Pass (39 for 2 days), not only does it cover the cost of admission (and if you're going to go to other museums like the Louvre and the Musee d'Orsay, it pays for itself) but you also skip the queues !
Cafe Panis is our favourite cafe on the Rive Gauche, right opposite Notre Dame. A great place to have coffee (or very good french onion soup) and watch the world go by.