Another great site is Kayak.com.
It has many changeable options which allow you to change things without reloading the page.
Also they take you to the cheapest site to book.
Originally posted by KAWS:
I found two sites that work great for flights. First one is flightnetwork.com and the second is sidestep.com. Both are pretty good for finding good flights. I like flightnetwork best because it will also pair you up with one airline going/one coming if it makes the flight cheaper.
We just got back from a cruise and one of the stops was San Juan. RIGHT at the pier is the Sheraton Old San Juan. It is probably a bit pricier but you save taxi to the pier because you can just haul your bags across the road to the pier and you're there.
Another suggestion for rooms is priceline.com Read biddingfortravel.com before you bid though to find out how and get some valuable pointers.