https://news.ycombinator.com/item?id=8218047
Personally I wished all those tourists that can't wait to get 'schroomed out of their minds' stayed at home but making drug use illegal for tourists and legal for the locals would be a legal and practical impossibility. They tried doing that in some places, all it led to was enterprising locals becoming either small time dealers or renting out their services to tourists.
Supply and demand. With drugs as long as it isn't legal everywhere I guess we'll continue to see this pattern.
Hope you enjoyed the museum, even in that state of mind, van Gogh was an amazing artist (and a substance abuser himself...).