Martin Lee recommends that you adopt a clear writing style without affectation. The reader should get a strong sense of your personality. Set the scene by detailing the season, climate and topography of your destination. Share your personal experiences and anecdotes using vivid reporting. Provide meaty, practical, accurate information. Include quotes from the locals. Edit your work for high literary quality: your grammar and syntax should be correct.
Examine the travel article from a fresh viewpoint. Move from the familiar to the unfamaliar or foreign as you write. Incorporate humour in your piece. Share your mishaps which could serve as potential comic material. Surprise your reader with unusual activities that you partake in or new people you meet. Think like a reader. What are your reader's travel aspirations? What is on his or her bucket list?
Don't forget the big picture: focus on a central theme which you introduce at the beginning and remind the reader about again at the end.
Courtney Carpenter (http://www.writersdigest.com/tip-of-the-day/breaking-into-travel-writing-the-5-elements-of-writing-travel-articles) recommends the following tips for a beginner travel writer:
1. seek out travel publications
2. no one starts at the top; find your own level and work your way up
3. start with local newspapers & magazines, regional travel magazines & small publications
4. don't give your work away for free; if no fee is forthcoming, ask for a free subscription, free advertising or free print services
For more information, read Travel Writing: See the World, Sell the Story (Peat O'Neil).