What cultural faux pas should I try to avoid making in San Juan del Sur?

"It is important to be respectful of local customs and traditions when visiting San Juan del Sur. It is considered impolite to show too much skin in public, so it is best to dress modestly. It is also important to be aware of the local language and to avoid speaking English too loudly in public. Additionally, it is important to be respectful of religious beliefs and to avoid taking photographs of religious sites without permission. Finally, it is important to be aware of the local tipping customs and to be generous when tipping service workers," remarked another expat in San Juan del Sur, Nicaragua.