Builders! Fantastic! It's all about roads, for me. Whenever I stick a builder on a city, he ends up being wasted because it gets harder and harder to keep adding to it, so I end up closing it and he just comes back. Stick him on a road, on the other hand, and you can just keep building and building. There are more roads than cities, so most tile draws will have some road on them. It's also more likely that the tile you draw will fit on a road than a city, and because of the nature of roads you can build away from everything else making it even easier. Doing this gets you an extra tile most turns! The second tile can be added to whichever feature you're working on, and the first tile (that triggered the builder turn) adds to the road. When you get bored, close the road and scoop up all the points it's earned!