I tend to book in advance so it goes a bit like this:
Wave of enthusiasm, check the hotlist, pick one, open comms, get it booked in, a bit of a high.
Then, a slump and feeling of apathy, and it feels like a forthcoming chore.
And then, the morning of the punt, another high, excitement going to the location.
The punt itself, well they vary. Some high, some low, many in the middle.
Then a period of apathy again, other interests, not bothered. Until, the wave of enthusiasm hits again.
Lather, rinse, repeat.