
Finnair and FinnComm Airlines fly from Helsinki to Pori Airport (IATA: POR, ICAO: EFPO) (45 min). One way tickets starting from 39 €.
Bus connections from Helsinki (3-4h), Turku, Tampere (2h), Oulu, Jyväskylä and Rauma (1h). Cost is about 30-40€ (Helsinki-Pori-Helsinki bus ticket for adults is now about 59 eur).
All the passenger trains go through Tampere. One way adult ticket from Tampere costs around 15 €, from Helsinki around 40 €. Tampere-Pori takes 1,5h, Helsinki-Pori 3,5h.
Drive the main highway 2 from Helsinki (3,5 - 4 hours), main highway 8 from Turku or from Vaasa (both about 2 hours), or road 11 from Tampere (about 1,5 hours).
Central Pori is comfortably small to be relatively easily explored by foot, or in the summer on a bicycle. The most attractions are within a short walking distance from each other. The few destinations further away, such as the Sigrid Jusélius Mausoleum (about 3 km from the city center) and the Yyteri sand beaches (about 15 km away) can be reached with a bus.
The normal price for restaurant meal is 20-30€. Fast food is obviously cheaper.
The main city center area is full with bars and nightclubs. They are situated at/near the main street Yrjönkatu. The agelimits are often 18, but in many it is 20. But don't worry, if you are 18, you can negotiate, and you may sometimes enter the bar/nightclub. But not always. Bartenders often ask ID from young-customers. If you are in Pori at the summer, go to Eteläranta, there are many nice bars and much to do.