Zihuatanejo.net
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As far as accomadations Ixtapa is the city next door to zih. they have the all inclusives. For the best deals some of the last minute packages are hard to beat if you can leave on short notice. We stay at a place call hotel los palmas. It is a small 6 room B&B about 20 miles south of town. Not much out there and that is why we like it. It is a little more spendy than the package deals that you can get in ixtapa.
If you get booked for a trip down there I can recommend a few captians also. Other wise just head down to the peir and look like you want to fish. Check out the flags on the boats from the day before and that will tell you who was catching fish. Some one will find you to book a trip.