Angkor Wat in Siem Reap. (Heng Sinith / Associated Press)

If the speed of transformation is any indication, 2011 is the time to visit the diminutive Southeast Asian country lodged between Thailand and Vietnam, not just to take advantage of Siem Reap's amenities but to go beyond Angkor to wonders still lost in the Cambodian jungle.

There are, for example, vestiges of the Khmer Empire as remarkable as Angkor all around Cambodia, including an older group of temples in the Sambor Prei Kuk area; Koh Ker, northeast of Siem Reap, opened to visitors since land mines, laid during the civil wars, were removed; and majestic Preah Vihear, on a mountaintop in the north where, until recently, Thai and Cambodian troops were engaged in a border skirmish.

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The once-inaccessible Cambodian countryside, with its lime-green rice paddies, jungly mountains, swollen lakes and rushing rivers, increasingly is opening, thanks to adventure travel agencies that take visitors there by horse, motorcycle and helicopter. Guests at 4 Rivers Floating Lodge, a new eco-resort on the Tatai River in western Cambodia, get the chance to spot secretive rhinos and elephants in the wild, while boat trips up the great Mekong River cruise through the habitat of the rare, freshwater Irrawaddy dolphin on their way to the friendly Laotian border town of Chhlong.

Nonprofit organizations abound, seeking volunteers to work in Cambodia (, and — a great way to take part in the country's cultural and economic resurgence.