Do "theme park" and "amusement park" mean the same?
One more question: what term do you usually use to denote going outdoors somewhere to the nature, maybe to the riverside or to the woods? Does "outing" suit?
Thx)

Question

Do "theme park" and "amusement park" mean the same?  
One more question:  what term do you usually use to denote going outdoors somewhere to the nature, maybe to the riverside or to the woods?  Does "outing" suit?
Thx)

Answer

An amusement park is a collection of rides and entertainment attractions.
A theme park is an amusement park where the architecture, rides and entertainment is built around some central theme.
A classic example of a theme park is Disneyland, where all the rides and entertainment are based on Disney movies, cartoons and characters.

Answer

Theme park and amusement park mean the same thing. 
Outing is acceptable. You can also say "to spend time/to be in the fresh air/great outdoors".

Answer

I have to say, that is a funny question. I can't imagine why this concerns you. A Theme Park can be an Amusement Park. The words themselves describe what the park is. Theme is theme based. Amusement is fun, theme or no theme.

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