I would assume from your description that you would be sailing on Carnival cruise lines. Short cruises with Carnival are renowned as 'party cruises' so be prepared for lively entertainment and clientele. 3 in a cabin is doable as long as you don't mind stepping over each other. Occasional offers can get you 3rd person free. With US cruises, a travel agent with knowledge of the field is useful as they can source out deals for you. in the US, changes in fares up to final payment(6 weeks prior) mean that cruisers can cancel with full refund or transfer the deposit to another cruise with same line. As a result, prices can and do often drop just after 6 weeks prior. FYI, Vacationstogo are good to deal with but far from cheapest in all cases. Also, the prices you see on the website do not include taxes etc which can add a bit to the fare. Bon Voyage!