On your guided tour of the Cu Chi Tunnels, you’ll learn about the history of this underground system. The tunnels were dug during the Vietnam War by Viet Cong soldiers as a way to move undetected and launch surprise attacks. Experience the tight squeeze firsthand by crawling through the tunnels, and fire assault rifles at the shooting range after. Pack bug spray and dress for hot and humid weather, arriving earlier in the day to beat the crowds and the afternoon sun. It's not recommended to visit the tunnels after a downpour, as the area will get very muddy. – Tripadvisor

This post office also houses a useful office center with phones and fax lines.