"take a spin" means go for a ride, or test it out. for example, you can take a car for a spin. here it means someone can try a hoverboard out.
"straight out of science fiction" - 'science fiction' is a genre of literature where the stories include creative uses of technology (like computers that talk, or shapeships that go to saturn). 'straight out of' means it's as if the idea came from it. for example, you might say about an outfit 'that's straight out of the 1800's', or, you might say about ice cube that he's 'straight out of compton.'