Hola:
I believe the Deep Sea Fishing is $270 for a group of 4 people.
The Dolphin Swim can be done two ways:
1) Bus to the marina and a short boat ride to the Aquarium - $89 per person
2) Bus to a marina and then a sail on a Catamaran with lunch and then the Dolphin Swim (not sure on the price, but more expensive than option 1)
We did option one and my wife and daughter loved it. You also get a Seal show and Dolphin show along with the swimming.