I would enthusiastically second this recommendation. I have traveled pretty extensively and this museum was surprisingly amazing. It is very deceptive as it has a small footprint above ground and is next to a high school football stadium, but most of the museum is below ground. When I went they also had a very well done and quite informative live science show that was geared towards kids but was perfectly good for adults as well. Also nearby is http://www.undergroundmuseum.org/index.php which is the only salt mine open to the public in the Western Hemisphere. I believe that it was also featured on an episode of dirty jobs as well. I spent a few months in Kansas and found both of these sites as part of the eight wonders of Kansas. I no longer live there, but will definitely make a trip back with my family in the future.

One thing to be aware of is limits to "unlimited" plans. I was living in Holland for a number of months this Fall and was on a pre-paid Vodaphone for voice and data. The "unlimited" monthly plan was capped at 500 megs and as soon as I went over it started to eat at my pre-paid stored balance in large chunks. While this sounds like a lot, it disappeared quickly. Just be careful and be sure to ask about this for whatever plan you get.