Well, I'm gonna give it a good go this weekend, my quest is to get at least one streetpass connection, hopefully someone with a mii enabled for sharing that I can use on the quest. Charged my 3DS last night and put it in sleep mode, started off near Newcastle and took the Metro system 15 stops to Newcastle Central Station. I'm now on a train to Kings Cross. Just turned my 3DS on for a look and I've clocked up 1115 steps, but still no streetpass. This weekend I'll go to Kings Cross, Camden Market, the Victoria and Albert Museum, the Hilton near Edgeware, the East End to see a show and then back to Kings Cross for the way back tomorrow. I'll keep my 3DS with me in sleep mode all the time, using the tube and walking.
I'm hoping the fact it's just come out and there aren't many owners yet will be compensated by the fact people are more likely to be faffing on with streetpass etc when they've first got it and it's still a novelty. I'll be quite dissapointed if I travel the length of the country and walk around the capital all weekend and don't get at least one SP log!