Pionerskiy (Russian: Пионе́рский pee-uh-NYEHR-skee) is a very small town on the Baltic Coast in Kaliningrad Oblast. It is very near to Svetlogorsk and has a beach that is very much nicer than the beaches in Svetlogorsk.
There is very little tourism in Pionerskiy, so it is perhaps best to make it a day trip.
A dozen of trains by day between Svetlogorsk and Kaliningrad Southern Station (with a stop at Kaliningrad Northern Station) stop at Pionerskiy. Also, there are autobuses roughly every hour between Kaliningrad Southern Station and Pionerskiy and also between Svetlogorsk and Pionerskiy. (Many buses from Kaliningrad to Svetlogorsk stop at Pionerskiy.)
Walk on the beach, There is a sea port on the Western side.