At least, we got a chance to because we were in a small group. In the midst of tourist season you're probably not going to be so lucky. Mind you, if you do get a chance to get close you will get wet.
You buy your ticket at the geysir discovery centre, where you can visit the exposition that explains you how cold water geysirs work, the history of the Andernach geysir, etc. Quite interesting if you didn't know this yet, with lots of hands-on things for kids. Written explanations are in German and English, but the running audio narrative featuring a little girl and her grandfather is only in German, slightly too long and it does get slightly annoying towards the end.
After you finish here, you get on the boat for a short trip downriver to the geysir (about 15 minutes). There are at the moment 4 departures per day, there may be more in summer and less in winter depending on the number of visitors and daylight hours.
You typically arrive 10 minutes before the eruption is due, so no need for rushing and pushing. The guide is quite knowledgeable.
An experience not to be missed when you're in Andernach.
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