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:
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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