Photo: GetYourGuideThis relaxed ninety-minute cruise is the easiest way to see Oslo from the water, gliding out from the city harbour among the wooded islands of the inner Oslofjord with audio-guide commentary along the way. You will pass summer houses, bathing spots and the odd sunbathing seal while the skyline slips by behind you. Sit on the open top deck for the best photographs, bring a layer even in summer as it can be breezy on the fjord, and book ahead in peak season.