Director of Marketing/E-Commerce for American Council of Engineering Companies, a DC trade association. Guest blogger at Copyblogger.com. Marketing specialist with 20+ years writing and web-based direct response campaigns. Founder of AdoptShoppe.com. Focused on email, banner and landing pages.
For pure B2B, nothing beats the free and fee offerings at http://www.marketingprofs.com/
I'm not a travel writer, but found this for you. Great tips!
http://www.transitionsabroad.com/listings/travel/travel_writing/seven_myths_of_being_a_travel_writer.shtml
I think the best answer is that it's a team effort. You know the facts of your story, but a good copywriter will transform the facts into something compelling, emotionally resonant and meaningful for the reader.