Mix and Mixture

Solution 1:

The differences between mix and mixture are subtle.

A mix of something is often descriptive of the make-up or components of a mixture:

The castle was built from a mix of sand and water.

A mixture, on the other hand, is the thing that is mixed:

The cake mixture is often a mix of eggs, flour, and oil.

There is a lot of wiggle room in usage and the distinction of when to use one or another is fuzzy. A general rule of thumb is to use mix when naming the individual parts, and mixture to describe the whole.

In the examples you gave, I think both would be acceptable, because you are either talking about a mix of hiking and camping that make up the trip, or the trip's "mixture" of hiking and camping.