I visited the Electric Ladyland last November after looking hard for things to do in Amsterdam that I may have missed over the years.
The museum is very small, but very interesting and eye-catching. The main feature of the museum is an interactive piece of fluorescent art that you can step into and explore. There are several interesting and trippy things to find, my favourite of which was the mirrors at the back corner.
Aside from the main piece, there are display cabinets containing hundreds of common and not-so-common objects that react differently when exposed to different kinds of UV light.
This was all very interesting and awesome to see by itself, but what really made my experience at Electric Ladyland special was the personal tour I was given by the museum owner. Various factors (off-peak season, outside the center, arriving early) meant that I was the only person at the museum when I visited, so the owner took plenty of time to explain the displays and how everything works, which was fascinating to learn and made the museum so much more interesting. He's obviously very enthusiastic about his work and it shows.
Whilst the museum is very small, it's one of the most interesting and unique museums I've ever visited, and for that alone I'd highly recommend Electric Ladyland to anyone visiting Amsterdam.