Why wouldn't you just take your 3DS with you wherever you walk?
I do. Didn't get coins fast enough even with changing the date multiple times a day. Got real tired of checking to see if I was at 1000 steps, yet, throughout the day to change the date, too. If I didn't change the date, it would've taken almost 5 months to get the # of coins needed to get all the Blue puzzle pieces I was missing to say nothing of the thousands of coins needed to get through all the Find Mii quests to get all the hats. And in the meantime, Nintendo probably would've come out with 3 more puzzles bringing down the chances of getting a new piece even further. When faced with the sinking hole that would likely never be gotten out of (without frequent access to StreetPasses, which I don't have), it was either give up on getting all the pieces/hats or take action to get the coins another way. Not big on giving up, without at least giving it a shot, and this worked out great after a few weeks of trying.
Getting 1,000 steps a day for 10 Play Coins is so easy.
On a small scale, yeah, but when you're looking at needing thousands of coins (puzzle pieces and hats), it falls terribly short of being sufficient.
Of course, you can't get more than 10 without changing the date like that...but that also screws up your Activity Log and all. I guess some people don't care, though...
I care. Just changed the date going into the future and then would move the date back at the end of the day. Kept repeating over the same 2-3 week period, so it just affected those days. Learned a lot about how the 3DS registers steps/coins for a day, in the process. For example, it doesn't matter what the step counter says when you change it to a new day. It allows 1000 coins
from that point. Therefore even if the step counter says 2500 when you change to that day, it'll register coins up to 3500. :lol
What's even easier is just getting puzzle pieces from StreetPass. =P
If I could consistently get puzzle pieces from StreetPass, I would use that instead. I don't, so I can't.

See this excerpt from the instructions on how to build it saying pretty much that exact thing.
You quickly see where being limited to the normal method of 10 coins per day, you're unlikely to finish the RPGs and Puzzle Questing without having easy access to a lot of regular StreetPass hits.
Doing this with StreetPasses would definitely be nicer, but just not everyone has access to such a situation. Even going to local StreetPass meetups (which I do) doesn't provide the tags nearly fast enough. It's great that you have the situation that you do with four 3DS's in the house together, but just not everyone has that advantage.
Nice Swapnote Youtube vid, by the way. Very clever use of the song.
