Disembark at 7:30am, then ride Naantali to Helsinki with a breakfast stop, 3h14m, 231km
It's also possible to ride down to Skagsudden and take the Parainen-Nauvoo ferry which runs pretty frequently, at least twice per hour (~60 times per day). That would enable a scooter ride like this extending the ride to Helsinki.
Saunas are an essential part of Finnish culture, and a great way to unwind after traveling. Head to Löyly Helsinki, a stunning, modern, glass-walled sauna complex situated right on the waterfront. You can alternate between the wood-fired saunas and taking a refreshing dip in the Baltic Sea. Note: Löyly is very popular, so be sure to reserve a time slot online well in advance.
If you enjoy the performing arts, check the schedule at the Finnish National Opera and Ballet. Even if you don't catch a show, the building is situated beautifully on Töölönlahti Bay. Alternatively, you can view the exterior of Finlandia Hall, an iconic conference center designed by the famous Finnish architect Alvar Aalto.
This landscaped park with on-site restaurants & cafes offers views out to the sea & nearby islands.
After your morning exploring Senate Square and Suomenlinna, head to the Töölö neighborhood to see one of Helsinki’s most unique architectural marvels. The Temppeliaukio Church was carved directly out of solid bedrock. The interior is stunning, with rough stone walls and an incredible copper-lined dome. The acoustics are also phenomenal.
Senate Square, a beautiful example of neoclassical architecture and one of the oldest parts of central Helsinki. It features the iconic, white Helsinki Cathedral, which is a must-see landmark.
Take the quick, 15-minute ferry ride from Market Square to Suomenlinna. This 18th-century sea fortress built on a cluster of islands is a UNESCO World Heritage site and a wonderful place to walk around, see the old cannons, and take in the maritime views.
[next morning before boarding the ferry] Helsinki Market Square (Kauppatori) located right on the harbor. It’s a bustling spot where you can browse stalls selling fresh produce, traditional Finnish foods, and local crafts.
Löyly has food, but these are also good ideas
Restaurants in Kallio
Restaurants in Punavuori
Hostel Diana Park is highly rated (8.9), 6 bed dorm rooms from $32 right in city center
Booked $36.65 (Breakfast option is $6 add later?)