I did visit Enoshima and Kamakura and spent probably an afternoon in the area, like between 10am returning Tokyo by 6pm. Depending on the season, I would probably visit different sights, and when I visited, the Hase-dera gardens were in bloom during springtime. There are indeed plenty to explore in Kamakura but if you are hoping to explore in half a day, it is still possible to do so.

There is a link to a model course by Odakyu Railway here: Enoshima-Kamakura Model Course

And if you wanted to know more about my experience, I wrote a blog post about my stop there.