If you're hiring a car in Vaasa, take the 2 minute drive north to see the Replot Bridge in Western Finland. The bridge is the longest in the country and connects mainland Finland with the outlying archipelago of islands. The smaller outlying islands are common to the landscape and most are available to explore via ferry trips, or you can take boat trips out to the smaller islands in good weather. Vaasa itself is also perfectly located to connect you to Sweden across one of the main ferry routes over the Gulf of Bothnia.
On a smaller island just out of the centre of Vaasa, lies the theme park Wasalandia. Through the summer there's a variety of attractions to entertain the whole family, no matter what age, although it's closed through the winter months so double check the dates of your trip to avoid disappointment. Hire a car in Vaasa and drive via the 6741 road to get there direct. If you want to explore more of the outdoors, Finland has plenty to offer- from ideal fishing spots, to horse riding, water sports and of course some great natural landscapes to hike or follow nature trails through. Depending on your level of expertise in each area, some activities can be undertaken by yourself or you can take a group tour if required.