you can see numerous museums - the Van Gogh museum is nice, the sex toy museum and shops and the women on the streets caged (if you are interested). You can also ride the train and proceed to Rotterdam (less than an hour by train) or Leiden (twenty minutes by train). You can walk along the streets of Amsterdam and go by the canal.
I went to a garden Keukenhof Gardens (you can ride a train to Amsterdam Central, then another bus) but I don't know if there are flowers by then.
There is train in the city and you can travel by it to nearby places.
Hmmm, what a, "Helpful," comment to what seems like a very legitimate and interesting post. I have never been to Amsterdam (or the Netherlands) but believe it is a fascinating city in very many ways and totally understand that Charles would wish to make the most of his time spent in the area. Glad to see prettydarkhorse affording some tips and hope the author has more forthcoming...
If I had a free evening in Amsterdam, I would love to go to a concert at the Concertgebouw, particularly if this was being given by the Concertgebouw Orchestra.
On previous visits, I've found just walking the streets is a wonderful experience, since there are many talented buskers.
If I had time for a meal, my number one choice would be a rijstafel. However, I have heard that these can vary a lot and that it is therefore useful to get a recommendation for someone local or from your hotel.
I agree with Writeangled, if you are tehre in the evening go to a show but the day is best spent just wandering the streets. I would recommend getting a map and making a circular route or you will end up going over the same damn bridge every forty minutes - and the chips (french fries) with mayonaisse, oh yes, and the beer. Amsterdam is flat and so hiring a bike is definately a worthwhile way to cover more ground, we decided not to and regretted the decision half way around and so missed the other half in a terrible experience involving bad women, beer and chips with mayo !
If you have only one day you have to go to the Reichs Museum and maybe squeeze in the Van Gogh Museum as well (they are close to each other). I also agree with WriteAngled about the Concertgebouw but they are closed on certain days.
Thanks for the advice here , I came to read it as we were talking about maybe visiting Amsterdam & after reading this we will as I would love to visit Ann Franks house . There are guide books however it is nice to hear other peoples opinions & ideas on places .