a travel iniated by my sudden decision. 其实这个用英语不太好表达,但是可以用后置定语来修饰,”一次自己顷刻决定的旅行“
You can travel anytime when you deside to.无论什么时候,只要你决定了要去,你就可以去旅行。是不是接近些?
for go trip
A prompt travel without further thinking/a second thought..
no-plan trip