Light Tackle Paradise (Marina Puerto Chico, Carr. Road 987, km 2.4, 787/347-4464, $350–450 half-day for 4 or 6 people) offers fishing excursions on 22-foot and 26-foot catamarans or 17-foot skiffs.
Tropical Fishing Charters (787/379-4461 or 787/266-4524, tropicaldeepsea [at] aol [dot] com, www.tropicalfishingcharters.com [1]) offers year-round big-game fishing, specializing in blue marlin May–October.
Links:
[1] http://www.tropicalfishingcharters.com