Fishing Pier Ideal for family, fishing, fun…small and quaint, located in the very center of the harbor overlooking the harbor entrance. Catch a variety of local species. Excellent for children. Picnic areas immediately adjacent, across the street from restaurants. Harbor Beach to the Pier Oceanside’s broadest beach is Harbor Beach at the northernmost part of town. Start out at the mouth of the San Luis Rey River and make your way south to the Pier. If you need to rest for a bit before making the return trip, check out the views from the end of the 1,600-foot long pier.