I also found, amongst the claptrap, large numbers of “sand picture” souvenirs, plastic rotatable frames within which lurid varicoloured sand is set in an oil of some kind – a sort of arenaceous lava lamp. Turn the frame and the sand drifts down to create a new “landscape.” I bought one of the least lurid and I have to admit that I have enjoyed experimenting with it. As shown below, I have created some vivid cross-bedding reminiscent of my kitchen physics experiments I described back in April. So, search among the tourist tat and you can find lessons in marine sand dynamics and the behaviour of granular materials!
[On the base of my sand landscape generator, I found the website of its maker, Baz-Art]