If you have two 3DSes you can get a villager everyday via Streetpass for each everytime the Server clock resets in Japan if you downloaded the Demo on both handhelds. This might help if you want to gather as much villagers as possible... for the 10 hour boulder for example. XD
I would like to say more about the bonuses you get for the Full Version from playing the Demo to max but that would be a spoiler.