As far as I know, all of the listed publications and publishing houses accept submissions from freelancers. If I am wrong about one, please let me know . Also contains news of the travel writing biz. The travel writers' section is small, but contains some good articles. Lists a few places to get published.
Interesting site is a clearing house for editors to find experienced travel writers.
Worth a look just to read the examples of successful travel writing diplayed on the site. Writers with a proven track record can apply to be listed here. The Society of American Travel Writers offers various benefits to its members including a monthly newsletter and conventions. There is not much information on the site other than membership information, however. A collection of interviews with and essays by established travel writers.