We just finished a 4 hours boat-tour (5.15 PM to 9.15 PM) in the tammasaari area with Matti, that was awesome. Matti is very knowledgeable and he makes sure that you learn everything about the archipelago, the local animals and trees. His boat is very safe and you also have time for a 40min hike on a beautiful island. Then comes the snack time at sunset with coffee and tea. Don't forget to ask Matti about his famous joke about Finnish and Swedish neighbours !