I'd say go for it for sure. I've been diving for years, and all over the world. In college, I dove for sea urchins to pay for school. Diving in winter off the coast of Maine is a kick and a half.
Even if you only use it once on vacation, you'll be glad you got it.
Someone said you need to dive yearly to keep your card current, and diving without a buddy is illegal.
Unless they've changed the laws and I'm not aware of it, neither is true. While you may be rusty, you're still legal even if you haven't been diving in years. Also, while diving without a buddy is stupid, last I knew that wasn't illegal either.
While commercial diving, we spent 6 or so hours a day in the water, and rarely saw another diver. We only came up to change tanks.
edit: I went through NASDS, by the way.