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After clearing customs (the part where they take a form you filled out and xray your bags) you'll walk around the corner to the exit. Just before you get there will be someone saying,"taxi, sir?"...

Arranging a pickup is usually more expensive because they are stuck there waiting and you could be delayed.

Based on the forum in which you are asking your questions, San Jose and Jaco.

Spirit uses the first one, SJO.

You got a good deal on JetBlue, and even without a good deal I'd still take them over Spirit. Sometimes when people tell you the great deals they found with Spirit they leave out the taxes and fees....