IMHO that greatly depends on what the specific issues of an individual are and what type of aids they are using. Anybody that is using an motorized aid will find it is SO much quicker and more convenient to simply drive up to Old Port Royal instead of waiting for the internal shuttle. And while the walk under the bridge takes away from it's beauty, CBR is a lovely resort and the walk along the Trinidad North beach is just a lovely scenario, esp. in the early morning or around sunset.
Many that are using a manual chair in daily life and are used to covering standard distances might find the same, even more so when combining a dash to OPR with going to the parks or coming back home. For those not used to using their own strength in operating an aid (manual chair, rollator, crutches, whatever), it will be quite a hike. For them it will all depend on how much energy that uses, what the plans are for the rest of the day, what they've done until then and their caracter. For some the internal shuttle will be the way to go, for others it wont be.