You can see Bøyabreen at quite close range from the main road in Fjærland, or admire it from the Brevasshytta restaurant, even closer to the ice.
This is one of the most spectacular of the glacier branches. When you visit the Norwegian Glacier Museum in Fjærland, you can see parts of it. A five-minute drive from there you can get a full view of the impressive ice fall. At the Brevasshytta café, you can sit by the big panorama windows and perhaps be lucky to see big blocks of ice crashing down.