In Colorado, one of the most progessive states when it comes to marijuana reform, there are actually places cropping up where you can take "tours" based on sampling high quality strains of locally grown marijuana. While the linked article pokes fun, I don't think this is too far off from actually happening as laws progress.
I did a little searching on Google and I very much believe that this could be a money maker. Based around World Cannabis week, a yearly event in Denver (around you guessed it, April 20th) the tours sound like a souped up trip to Amsterdam where the fun is taken care of, all-inclusive style.
Each of the three packages offered for this particular tour include individuals being picked up at the airport, connecting them with marijuana-friendly motels that are fine with customers consuming on their premises, as well as connecting people with concerts, cannabis samples, etc..