These are some tips that will help you to receive travel writing jobs.
The key is that you must look for them.
No one else will do the work for you.
It's up to you to go after what you want in life.
Many people give up on their dreams or goals because they do not put much effort into it.
They do some work and walk-away because their dream did not come to fruition overnight.
5 Tips to Finding Travel Writing Jobs

1. Start a blog.
   This cannot be stressed enough.
   A blog can be used as your portfolio.
   Providing a link to your site is easier than submitting 10 samples! Of course, there are some organizations that prefer to have one or two samples (Word format) sent to them.
   
2. Write each day.
   Your writing skills will improve over time if you write each day; your portfolio will grow as well.
   
3. Travel.
   You must travel to write about it.
   Start with short trips within you state or bordering states.
   If you enjoy traveling abroad, go for it!
4. Take a writing course or two.
   If you are not a strong writer, you will need to develop your writing skills.
   Travel writing is no different than any other career.
   A CPA must keep up his license and skills with continuing education.
   Travel writers must brush up on their writing skills and learn new writing techniques.
   This can include learning how to use SEO.
   
5. Look for travel writing jobs on the internet and in your backyard.
   Remember, the "genie of the universe" will not drop travel writing jobs into your lap! You must look for them.
   Consider taking other writing jobs besides travel writing.
   These jobs will help strengthen your writing skills.
   

Give your travel writing a chance.
You would not plant a garden and then dig up the seeds each day because the vegetables you expected were not there the next morning! Travel writing is the same way.
It will take some time.
Sit back and enjoy the journey; you'll arrive at the destination soon enough.