Gdańsk, Sopot and Gdynia sit on a single commuter rail line along one Baltic bay, close enough on a map to look like one city. They are not. Gdańsk is Hanseatic brick and centuries of port history. Sopot is a spa resort a French army doctor more or less invented in the 1820s. Gdynia barely existed before 1920, built from a fishing village into Poland's main deep-water port once the newly independent state found itself with a coastline and no proper harbour. The SKM, the Tricity's commuter line, runs the length of the bay every seven to ten minutes at peak times and every fifteen to twenty off-peak. Gdańsk Główny to Sopot takes around 15 minutes; on to Gdynia Główna adds another 15.
That extra 15 minutes matters more than it looks two days after a marathon. Search online and confident strangers will insist Sopot and Gdynia are an easy single day out, and for fresh legs they are right. What that advice leaves out is what 42.195 kilometres does to a body less than 48 hours later. The plainer version: base in Sopot, and treat Gdynia as a trip for a different day, not this one.
Getting There
The SKM runs from Gdańsk Główny to Sopot in around 15 to 20 minutes for roughly 7 to 9 PLN one way, with trains every 7 to 10 minutes at peak times. Buy a ticket from the yellow platform machines or the SKM app and validate it before boarding. Sopot station drops you at the top of the pedestrianised main street, a flat five-minute walk from the sea.
The Pier and the Seafront
The pier is the reason to come. Jean Georges Haffner, a French army doctor, opened Sopot's first sea-bathing resort in the 1820s and built a modest wooden jetty so patients could reach the water; that jetty is now the longest wooden pier in Europe, 500 metres of pine boards running straight into the bay. For legs two days past a marathon, it is close to ideal terrain: wide, flat, ramps instead of steps, and benches every few metres. A paid entry ticket applies from late April, around 8 PLN per adult, so race weekend may catch either the last free days or the first paid ones. From the pier's tip, the beach runs unbroken for about 4.5 kilometres of firm sand; keep to the damp strip near the waterline if tired calves want distance without effort, since the sand higher up turns soft.
Monte Cassino and the Crooked House
Ulica Bohaterów Monte Cassino, known locally as Monciak, is Sopot's pedestrianised spine, sloping gently from the station down to the pier, lined with cafés, amber shops and ice-cream counters. Partway down stands the Krzywy Domek, the Crooked House, a building deliberately warped as though seen through a heat haze. It holds a small shopping arcade and is worth a photograph from the street rather than a special trip.
Orłowo, Not Gdynia
If legs allow one extension beyond the pier, take the SKM two stops further to Orłowo rather than pushing into Gdynia proper, a run of about 10 minutes. Orłowo is technically Gdynia's southernmost edge, but it behaves like a quiet seaside village that got separated from Sopot by an administrative line rather than by character. Its own small pier, 180 metres of whitewashed timber, points at the Klif Orłowski, a wall of glacial clay the last Ice Age left rising out of a beech forest, and a flat path along the sand connects the two towns without asking for more than a longer walk on the same flat surface. Gdynia's real sights, the museum ships at Skwer Kościuszki and the Emigration Museum in the old Marine Station, sit spread along a working port some distance apart, and reward a separate day with fresher legs rather than a rushed add-on straight after the race.
Where to Stay
Two seafront hotels put you within a flat walk of the pier: the Sheraton Sopot, directly beside the pier entrance with a full spa, pool and thermal rooms, and the Sofitel Grand Sopot a few hundred metres south, an Art Deco building from 1927 with its own spa and rooms right on the sand. Either lets you move from bed to beach without a taxi.
Where to Eat
Bulaj, on Aleja Franciszka Mamuszki a few minutes' walk south along the front, does fresh Baltic fish plainly and well in a family-run dining room; book ahead, since the room is small and the beach terrace is a summer-only affair. Bar Przystań near the fishing harbour has fried fresh fish fast and cheap at shared tables for over 25 years, though as a beachfront spot it leans on the weather, so check before walking over.
Getting to Gdańsk Airport
From Sopot, take the SKM south to Gdańsk Wrzeszcz and change onto the PKM line to the Gdańsk Port Lotniczy stop at the terminal, roughly 35 to 40 minutes door to door; the PKM connection runs less often than the main SKM line, so check the current timetable rather than assuming it matches. A taxi covers the same distance in about 25 to 30 minutes and skips the platform change, worth the fare with a medal, a bag and legs that have run out of enthusiasm for stairs.