http://hotels.comhttp://orbitz.comhttp://www.panamabeachrentals.com/
there are quite a few sites that you can search that will likely show you great hotels at the best prices available. check out the website BookMe and you will be able to compare prices on all the reputable travel sites in just a couple minutes. it s very convenient and will save you a bunch of time and money. Also, make sure you buy them online... otherwise they charge much higher fees for phone orders. good luck.
vacationrentals.comYou might have difficulty, if you do not have someone over the age of 25 with you, these are private homes/condos being rented and many have age restrictions.