Golden Circle day trip options

Hi,
Day trip to golden circle is on our agenda next week, and we are considering two options, the second option includes snow mobile ride:
http://www.viator.com/tours/le-Classic-DayReykjavik/Golden-Circ-Trip-from-Reykjavik/d905-2970AH12
https://www.re.is/day-tours/gullfoss-geysir-langjokull-snowmobiling

Any suggestion? Snowmobiling sounds like fun, but we want to make sure we make the most of the golden circle, and not sure if it worth the extra cost... anyone done one of those trips and could recommend?

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