In winter Heinabergslon often freezes over. This makes it possible to walk out on the ice to the icebergs. Be careful walking here alone and without safety equipment. The ice is usually thick close to the icebergs and if you go through you have to have ice spikes and rope to come back up. Go with a guide that knows the lagoon and can guarantee your safety.

I recommend reaching out to Stepman, he's the best guide in the East: https://www.stepman.is/