The jaguar stood at the door of the temple. The smell of blood from within assailed his keen senses. He placed one paw, and then another, over the threshold. The priest walked to the door, as the sun’s light faded, and greeted the warrior Tepiltzin.
The party had driven the beasts to the edge of the cliffs, the kill was swift. Tlilpotonqui smiled broad and warm. It had been a fine day. His smile faded as he spied the crescent Moon already hanging delicately in the sky. The west was fading to pinks and golds. In his excitement, he had forgotten the time. He fell back, letting the party get well ahead, and turned towards the cliffs. As the last rays of the Sun faded he dove towards the rocky waters below…
When running a new party, get around the question of plot density by having the first discovery to be a deck of fate, or whatever you call it. If you use a real deck, you should definitely stack it to have the desired outcome, which is to curse the party to attract weird things to happen and involve them. This should not be told to the players at the time, so that they won't just up and try to get themselves 'decursed'. Though quite why they would want to is beyond me.