Otteralum, I noticed you registered in 2005. I am curious to know how many visits you have had to AC. I am just wondering as after several trips there my observations changed quite a bit and even moreso after living here.
True we do not have topless beaches.
As far as offending the locals, 90-some percent would not be offended and in fact love it if a woman went topless. (men love it, woman chuckle.) I am not advising this person to walk the beach topless, however. I remember taking my top off on one of the boats when I was a tourist and the men loved it, woman were impressed with my guts and some joined me. No one offended. They just though I had guts.
Though most are catholic, they are not 'very conservative' as you mention. Do you go out to the late night scenes? I do not observe this culture being ultra conservative like much of central and south america. Example... young, young people having babies and different dad's means there are activities that are common/normal there that don't follow catholicism strickly.
Plenty of other issues/topics too which they are not too concervative about.