Well since no one actually answered the OP's question, please allow me to be the first...
The question about re-furbishing an older cart vs. buying a newer one is unfortunately too vague. You can likely find some older ones that just need new seats, tires, batteries, etc., but that all adds up quickly. For basic riding around purposes, a 36V cart would work fine and is a little more affordable. Now if you expect to do a lot of driving with it and maybe "carrying extra weight", then the 48V would be much better. Even at $2000, you're not likely to get a cart that doesn't require some work. But on the other hand, you should easily be able to find a cart in the $3000 range that is turn-key.
We often take our golf cart camping. Especially at larger campgrounds that have a lot of amenities, the carts are a must.