好，我试试，布宜诺斯艾利斯三日游，供参考。

我是不是该换个职业，搞旅游团，怎么那么爱写几日游？

* One-day: Walk from Plaza de Mayo to San Telmo, best on Sunday (there is a market). Then walk toward the water front, and toward Puerto Madero. Evening at Puerto Madero possibly.
* Half-day: Walk around Recoleta region, including the cemetery.
* Half-day: Walk along Florida, to or from San Martin square, people watching and shopping if needed
* Half-day: An afternoon lunch in La Boca with some Tango show, leave before dark.
* An evening at Palermo Viejo, arrive before dark to see the area.
* An evening at Colon theatre, if there is a concert or opera; otherwise, consider a tour of the theatre during the day.
* If you have more time, can spend at Palermo Viejo, or walk a bit along Mayo ave.

Metro and bus are convenient. Taxi is not expensive.
Safety: common sense is enough. Avoid wearing 名表 perhaps?