Here's two alternate strategies:
1) Book nights 2 and after in Temecula. Book night one at an airport hotel - I assume you're flying into ONT or another airport not too close to Temecula. Then just rent the car the next morning to drive to Temecula.
2) Same as above except book night 1 in Temecula at a hotel that allows you to cancel same day.
Hope this helps.