Mystery.

Self-help books or how-to books?

How-to books

Rain or Snow

Rain.

Hope or faith?

Hope.

Country or city?

City

Beach or Swimming pool?

Beach

Northern for Southern hemisphere?

Southern - if only because I've never been there and would love to see the scenery and the Southern night sky.

Dark or white chocolate?

I'm not particularly fond of either, but I'll say Dark Chocolate, because White Chocolate tastes a bit too much like sweetened butter to me.

Realistic Fiction or Historical Fiction?

Historical Fiction - the reader often gets a different slant on a historical person or event and it is a good way of an author to surmise a particular theory about these which cannot otherwise be proven either way.

Miles or Kilometres?

Miles (not used to kilometers)

Yards or Meters

I can think better in yards, but meters is more versatile for science and international communication... so, meters.

Economics or Civics?

Economics, to make sure we understand what our civic leaders are up to.

Physics or Chemistry?

Chemistry. . . all the way

Pie or Cake?

Cake.

Swimming or diving?

Swimming.

Paper or digital calendar?