Is there any difference between 計画【けいかく】を立てる【たてる】 and 計画をする? In Sou Matome N3, the first one appears as "to make plans", as for the second one (being a suru verb), I assume that it can also be associated with to make plans.
I think there is almost no difference in their meanings, and the two phrases are almost always interchangeable. I said almost because I can not think of even a single counter example in a few minutes as a native speaker.
By the way, you can also use a verb, '計画する', without 'を' in a similar way. For example,
are similar to
The first two sentences are not completely the same as the last one. The last sentence sounds to stress more that the decision is made to go to a trip compared to the first two, which sounds to have more stress on deciding on the details during the trip.