I stayed there in November and I remember walking along the beach and when I got to the outskirts for the resort, along the beach, a security guard asked me to sign out and sign back in when I returned. I can understand your frustration with the security along the beach, but if they allow you on the beach, then you pretty much have access to the entire resort. Not that I have a problem with that, but they have security at the front gate of the resort, it makes sense for them to have security at the other points of access.
FYI--outside the resort, along the beach on the opposite side of the Plaza Indiana, is a hut with a dude selling sea shells. Really nice guy, nice shells, good price (I think).