Improve the bracketed part of the sentence.
It wouldn't be a pleasant ride, (wouldn't it)?
The rule when using question tags is to take the verb and use its negative as a question tag.
So, as the sentence uses the verb 'would not', the question tag must use its negative, 'would'.
Therefore, the correct answer is option 2.
Improved sentence - It wouldn't be a pleasant ride, $would $it?$