somethingbrite:
Riga can be a little spooky, especially after dark?
It's like any other big European city, where after dark you can't be sure about your safety. But comparing to big cities, Riga is still too small

Comparing to London, it is a calm resort. It's not critically dangerous, and specially nowadays, most often on deep evenings you won't see lots of people walking.
somethingbrite:
What are the things to watch for?
That's the standard question we are answering for few years already. The most comprehensive guide about it is told in
Riga in Your Pocket edition. Get one on the airport's exit. It will tell you everything you should know, what to watch and where to check.
somethingbrite:
Are there any neighbourhoods to avoid?
I doubt that you will travel far away from the Old Riga or Riga Center. Most of criminal "neighborhoods" are starting 5 km from the center.
somethingbrite:
Gangster bars or clip joint scams to look out for?
Riga is too young for this

Regarding bars - be aware that most of the Old City cafees and bars are now quite expensive. I suppose, they could be even more expensive than in London, but comparatively poor in drinks and food. We are experiencing not the best economic times for now.
If you have a decision to travel to Riga, better do it right now, in Summer/sunny time. Then go to Jurmala or some of the beaches. Skip architecture and other things. Watching live young girls showing their legs and tits is a more pleasant business
