I have this trouble, too, Jack.
Add to it, sometimes, such as in the case of travel to a summer resort during the high season, you often have to make the decision many months in advance in order to get the accommodations you want.
For me the essence of vacation has not been running around seeing things; it's been going some place and plopping myself down and not having to do anything. Now I find myself facing my fiftieth birthday next year, feeling that my life is, what, maybe two-thirds--or more--over, and feeling that I've hardly been anywhere or seen anything and have thrown away vacation time "just relaxing"--except that "just relaxing" is what I've always felt I needed. So that conflict in demands on vacation time induces stress and tends, in me, to also induce a kind of stasis, an inability to make up my mind what I want to do with the time now available.