AF active Area and AE Metering question

Recently I was asked to do a review of bus ride, which I will do on Monday.  The bus ride is a double-decker thing that tourists ride and enjoy watching the sites of a city.

I`ve actually done this once before, but a different course to the one I will do next week and also with a point and shoot compact.  However, this will be the first time I do it with a DSLR (i.e. Pentax K-30).

The bus at times will be moving at fairly high speed on freeways etc, and at other times it will be moving at very sedate speeds.  As I`m not really a pro yet, I`m quite worried about the camera focusing correctly, especially when the bus is moving quickly.

For AF Active area which would be better: 5 AF points, 11 AF points or spot?  I`m thinking spot might be the best, but would like a second opinion.

Similar question about AE metering: multi-segment, center-weighted or spot?

Any thoughts or ideas would be really appreciated

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I live in Tokyo, one of the greatest cities in the world