The stage and screen star took the Responsible Tourism best article prize, with judges describing her piece as "colourful and engaging without being preachy".
There were other British winners in the awards, which are sponsored by Virgin Holidays.
The Scottish island of St Kilda was judged best destination for conserving architectural heritage. Between 2008 and 2010 the National Trust for Scotland carried out a restoration of buildings left in disrepair when the last islanders left in 1930.
Brighton-based Big Lemon Bus Company UK and London and Sydney-based Green Tomato Cars were joint winners of the best in responsible transport award. Both companies use low-emission vehicles.
Hampshire-based holiday company Explore was judged best tour operator for promoting responsible tourism.
Awards were presented at World Travel Market in London.