aaron1262 is correct and I was wrong. You can guess on each week's experience, as per the rules (which I finally got to copy):
Participants may Guess on as many Experiences as they choose. LIMIT one Guess per person, per email address, per Experience will be permitted during the Sweepstakes Period.
The sweepstakes rule-making folks have also covered the bases on what happens if no one correctly guesses the correct location for a specific week:
A random drawing for each Experience will be held at the conclusion of the Sweepstakes Period from all eligible entries received. If only one eligible entry was received for that Experience's drawing, than that entry will be determined the Winner of that Experience's prize. If no eligible entries were received for an Experience's drawing, then a second chance drawing will be held from the non-correct Guesses from all 52 Experiences that were submitted during the Sweepstakes Period.