If you are looking to make a little escape from your busy daily life but you don't have time to go too far, then Enoshima might be the perfect place to go.
About one hour away from the center of Tokyo, Enoshima is quite a popular destination, both for Japanese and foreign tourists, so unless you want to see the Enoshima fireworks display or some special festival, I recommend you to visit off-season. And when the weather is nice. It will surely become a wonderful day!