A nice place to start would be the Dao-Dao Islands some seven to ten minutes away from the seaport, when riding a motorboat.
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There is also the White Beach that, as its name suggests, is a stretch of white sand beach just minutes southeast of the seaport. The clear, deep, blue waters (even during low tides) are excellent for swimming and diving.
The Bomba Beach, located in barangay Bomba some 2 kilometers away from the city, is also a good area for swimming and fishing, with a bomba bridge and natural coral reefs.
The coral reefs are artificially made, but the whole place is very much ideal for swimming, fishing, and boating.
During low tides, a smaller, more undeveloped island appears and like the rest, is also suitable for fishing and swimming.