What does On the surface, things around here look pretty tame, right? It looks like it, but it never stays calm for long. mean?

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The girl said this since 1:15 in this video since she's talking about her life after involved in the war of transformers:

https://www.youtube.com/watch?v=_iGJXwtZJ_U

What does she mean by "pretty tame"?

@newenglandgenie The last question, then also since 1:15 in the video, she said "It looks like it, but it never stays calm for long. We’re going to try to take a mini-vacation, but the battle between the Transformers is still raging on, big time. And hopefully the Autobots can finish off the Decepticons, so we can attempt to have a semi-normal day."

https://www.youtube.com/watch?v=_iGJXwtZJ_U

What does she mean by "big time", "semi-normal day"?
And does "never stays calm for long" mean "the peace never last long"? And "raging on" mean "the battle between Transformers are going on more and more intense"?

@newenglandgenie So "big time" just mean "The battle is still going on very fierce" and that's all?

@newenglandgenie "And hopefully the Autobots can finish off the Decepticons, so we can attempt to have a semi-normal day.", should i describe it as "We hope Autobot can destroy all Decepticon so we can temporally have a normal day"?

Is there any special meaning of the word "attempt" in this sentences?

@newenglandgenie Thank you very much, you helped me a lot today!