Blue Lagoon Rating:
The ship's tour was only transportation to the Lagoon and back. We purchased tickets online to gain admittance and use the facilities. This saved us a lot of time from standing in line. Expensive ( $170 for the two of us that included towel, robes, algae scrub and drink) but it was a once in a lifetime experience. Really unique.
Golden Circle Rating:
Although we usually arrange for private tours, we booked a six tour package through the cruise line. And in general were not disappointed. The Golden Circle is a must when in Reykjavik. Waterfall is so awesome.