Abaya, This is not a subject to be taken lightly. Do a little research. I also have dual citizenship. I won't get in to the specifics on a public forum but suffice to say I got in to some serious trouble traveling with both passports. At the very least, check with your passport office before you go. Different countries have different laws about entering with two passports. It has only been in the last ten years that the US has relaxed some of it's laws. Indeed, the US government still does not "approve" of dual citizenship (though it does allow it) and has some very specific rules.
Here's a site with an overview tho' I can't guarantee it's accuracy.:
http://www.richw.org/dualcit/faq.html