We requested Jamaica 45 or Aruba 51 on our last trip, and ended up in Jamaica 46 which was just behind 45. Turns out there weren't any king rooms in Jamaica 45. You should request specific building numbers, because even within each "island", some buildings are closer than others and there can be a long walk even in between buildings.
Our room in Jamaica 46 was good for proximity to the main pool and food court - it was over the bridge, around the curvy path of Caribbean Cay, and then through the courtyard area by the main pool. We did find it confusing since our room was towards the back by the parking lot - lots of twisting paths and we could never get our bearings. At check-in, we had our luggage with us and were told we should take the internal shuttle to our room and have bell services deliver our bags (bags not allowed on the internal shuttle). We needed our bags right away so we opted to walk, against the warnings of the front desk CM. It was a big mistake - a good 20 minute walk rolling a suitcase. Thought my arm would fall off! Only downside of the location I guess.