I usually had a general destination and a return date. If there were specific events/sights I wanted to see along the way they were options within a rough itinerary. But I tried not to lock in specifics unless I knew lodging/flights had to be scheduled in advance for I found that my most enjoyable moments invariably came from things we happened upon by chance, or because we happened on a detour that struck our muse. And on the rare occasion where we found our original destination wasn't up to our expectations, it was nice to have the luxury to totally jettison and carve out a Plan B on the fly.