If you check out the
map , you'll notice that Trinidad South is outside the major loop circling the resort. This means you have to cross the street to get to the other villages and Old Port Royale.
While the road isn't overly busy, it is the main road circling the resort, used by all the cars and buses that come through. There's a big crosswalk where you could cross safely. I don't think it would be a problem for you since you won't have kids with you, but I wouldn't want to deal with it if I had little ones.
I think you would like either Aruba, Jamaica, or Barbados. Jamaica and Aruba are the most convenient to the bridge to OPR, while Barbados is closest to the Customs House.
Personally, I thought Jamaica was the prettiest area, so you might enjoy that. When I was walking around there, buildings 42 and 43 seemed the quietest. 41 is right next to that road, so you don't want that, and 44 and 45 seemed more busy because they're by the pool, playground, and bridge. We stayed in Aruba 53, and that was a really quiet area also, as were most of the other Aruba buildings.
Happy planning!