Extending Charlie's recommendation: your travel roles look like a great source of segmentation.  I would develop a blog section for each of these, and provide subscribers the option to choose one or all when they subscribe.  Marketo has done a great job of this on their blog.  Here's one example:
http://blog.marketo.com/blog/category/b2b-marketing/marketing-automation
Note they only ask for email address.  The perfect funnel might look like this:
- 
		Prospect finds blog via social media or Google
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		Prospect subscribes with their email address for more information.  You don't put this into Salesforce because they didn't ask to be sold
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		Prospect enters your nurture track for their specific interests.  This might include previous best of blog posts, new content offers, etc
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		Prospect fills out longer form, adding name etc when they download email content.  This triggers them entering your CRM and is more justified by their digital body language
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		Salesperson contacts prospect, who has now seen your brand a dozen times and is comfortable taking your call