If your family plans to spend spending your entire trip near Reykjavik, Jokulsarlon is likely too far for a day trip (a nine-hour drive there and back without stops) — which is one of the main reasons that it’s worth making the full drive along the south coast and taking your time to see sights along the way. The huge chunks of blue glacier floating in the bright water are unlike anything you’ve ever seen, and you’ll remember the lagoon as one of the highlights of your trip. On the black-sand “diamond beach” surrounding the lagoon, search for ice diamonds to touch and photograph; sometimes they’ll be small enough to hold, and sometimes large enough to stand next to. Companies offer boat and kayak tours that take you out into the lagoon, but it’s just as stunning from the shore.