I thought long and hard before answering this onr. Although it fits the patter nor using sino que, if is a correctionof the first statement, the second statement is a contrast: something practical rather than something material. It is ambiguous depending on the circumstances and "pero" can be used following both positive and negative first statements.
Yes, it is quite hard in negative sentences. I see what you mean, but I see the second sentence more of a "substitution", which would use "sino que". It is substituting the material present with something that is not material, " a trip to Cancún".
I will look into this a bit more anyway.
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