It's been a few years so I'm extrapolating, but I'm guessing:
At a minimum dress shoes or clean sneakers, socks or hose, long pants, buttoned or polo shirt. No symbols or statements or logos on any attire, nothing that would be interpreted as "gang colors", all tattoos covered, no logo or outlandish headgear. Hats in general should not be worn indoors (disrespectful) nor should bare feet be displayed in most southeast Asia countries.
(Don't even get me started on "proper liberty attire" for Navy women in Muslim countries. I'll be over here restraining my spouse from venting her own opinions. OK, back to the command training
Brief your chain of command on your liberty plan and follow it, use a liberty buddy, no public inebriation, no public displays of affection or aggression, no loud voices or exhuberant gestures, no confrontations, no motorcycles, no jitneys, no tuktuks, no houses of prostitution, take a package of condoms with you, venereal disease may be a violation of UCMJ or even life-threatening. Don't go to the following off-limits establishments (long list includes addresses & phone numbers in order to facilitate directing cab drivers and making reservations). Don't join demonstrations or crowds. Don't rent hotel rooms. Don't get married.
No shore leave authorized. E-3 and below authorized liberty only with liberty cards and to expire at midnight. No exceptions.
Take care of each other. Liberty incidents will be judged cause for imposing additional restrictions.
And hey, no fun! What, did you think you were joining the Navy to see the world or something?!?
But that's just what I've been told by other surface sailors & aviators. As a career submariner my liberty ports were limited to garden spots like Guam and Yokosuka.
We need someone here with real-world battlegroup experience. Boxkicker, can you help me out?