Right after I started this thread, I had a good stretch where it was really useful to run a colony ship between existing colonies for quite a while. I don't do hard numbers obssession, but I understand that colonies over 2 billion grow much faster than ones under 1 billion, and people=money in this game.
But oddly enough, I've hit a similar game calendar time in a few games since then and the combo of my tech level & map specifics have not made it worthwhile to do the Interplanetery Wagon Trail thing.
With that in mind, what would be the best population-to-farm/entertainment structures, assuming that's all you built?
If you're asking about templates for cash-cow planets, folks like Mumblefratz and Iztok Bitenc might have some interesting replies. I don't like to overspecialize until the very late game, but I also like as many worlds as possible to pay well. For class 10 and up, I build one farm and two entertainment tiles. Sometimes I need a third entertainment tile for a while on some worlds, but I try to remember to go convert them to markets or something else after my morale tech is high enough.