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I am working on a travel site about a specific region, which includes information about lots of different topics, such as weddings, surfing etc. I was wondering whether its a good idea to register domains for each topic since it would enable me to build backlinks. I would basically keep the design more or less the same and implement a nofollow navigation bar to each microsite. e.g.
weddingsbarcelona.com
surfingbarcelona.com or should I rather go with one domain and subfolders: barcelona.com/weddings
barcelona.com/surfing I guess the second option is how I would usually do it but I just wanted to see what are the pros/cons of both options. Many thanks!

Hi there, I am new to MOZ Q&A and  first of all I appreciate all the folks here that share their expertise and make everyone understand 'the WWW' a bit better. My question: I have been developing a 'travel guide' site for a city in the U.S. and now its time to choose the right domain name. I put a strong focus on SEO in terms of coding, site performance as well as content and to round things up I'd like to register the _best _domain name in terms of SEO. Let's suppose the city is Atlanta. I have found the following domain names that are available and I was wondering whether you guys could give me some inside on which domain name would perform best. discoveratlanta.org
atlantaguide.org
atlanta.travel
atlantamag.com Looking at the Google Adwords Keyword tool the term that reaches the highest search queries is obviously "Atlanta" itself. Sites that are already ranking high are atlanta.com and atlanta.gov. So basically I am wondering whether I should aim for a new TLD like atlanta.travel or rather go with a .org domain. I had a look around and it seems that .org domains generally work well for city guides (at least a lot of such sites use .org domains). However, I have also seen a major US city that uses .travel and ranks first. On the other hand in New York, nycgo.com ranks well. Is it safe to assume that from the domain names I mentioned it really doesn't matter which one I use since it wouldn't significantly affect my ranking (good or bad)? Or would you still choose one above the other? What do you generally thing about .travel domain names (especially since they are far more expensive then the rest)? I really appreciate your response to my question! Best, 
kinimod