Take them both.
I am a dually. American born and raised with a Canadian Mom. Born outside Canada to a Canadian parent. Picked up the passport a couple years ago with my citizenship card.
I have carried both of my passports for the past 7.5 months, and I´ve ONLY used my american one.
Boliva charges America passport holders $135 for a 5 year entry visa.
Paraguau charges Americans $45.
Brazil charges $100(?)
Just use your Irish Passport for those countries. Or for all of them.
I already have a Bolivian visa from the summer of 2008, so it makes sense for me to carry my US passport. I´ll likely run out of pages though, and might have to bust out the Canadian one for the end of the trip...
Just take them both, and store one securely somewhere.
Also, there are a hell of a lot more American embassies in Central and South America than Irish ones. Lose one passport, you have another. Lose one and dont have a backup... OOPS.
--Alex
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