How do I give variety to dates?

There's a girl who I'm planning on asking out for a 4th date, and I hear that it is good to see someone in different situations. On our first date, we did mini golf and then met with friends for pizza, our second date we had dinner followed by a talent show on campus, and our third date we saw a concert event on campus. I'm trying to think of a good different date but I dont have many ideas. It's slowly starting to get warmer (we're in Idaho) so maybe there's some stuff we could do outside, but even then I still don't know.

How do I give variety to dates?
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