"For legal reasons, Travel Channel cannot accept unsolicited ideas or material, and any unsolicited ideas, pitches or material will be returned or discarded unread. Travel Channel accepts proposals only from established production companies that have previously discussed their idea with a network development representative and been asked to submit a summary of the idea or that have received an RFP."

To get around this you should have a very strong online presence like a youtube channel with millions of hits steady on your vids.

Good luck. Travel shows are one of my favourites.