Some General Ideas Worth Considering:

Watch birds and other wildlife for signs of activity.
Consider vegetation and oxygen rich areas (depth, sunlight, sun arch, and surface visuals).
Consider currents, eddies, whirlpools, and basins.
See how others are doing.
Check fishing reports.
Ask the local bait & tackle retailers.
Subscribe to an informative magazine.
Use a nuke in the Pacific - Tons come up filleted, cooked, vaporized, and tenderized!
Drink a beer and/or smoke a cigar and enjoy some of the peace and solitude of your surroundings.