The Adult Communities are no different that any other HOA:
Each is unique; some are run by Corporations with on-site management, very businesslike.
Some are run by residents and can be little fiefdoms, dictatorial and self-serving.
Some have common grounds and an electronic gate.
Some have elaborate facilities, pool, clubhouse, tennis courts, 8' razor-topped walls with manned-security gates and more.
In any case, the CCR's can vary with the facilities.
The normal procedure is; when you make an Offer for a place, you can purchase a copy of the CCR's and read to your hearts content.
The alternative is to go visit the compound, walk around and meet some of the residents and talk to them about living there; the restrictive rules and unreasonable regulations.
Most of this information is not available to a Realtor, unless they had previously sold a unit in the park.