Travelers want flexibility, which is why we offer free cancellations on the majority of car rentals. If your Mount Diablo State Park plans change, just log in to your account through the
Trips portal, select “manage booking” and then choose “cancel this car.” Flexibility is just the beginning of the benefits of booking a ride with Expedia. Bundle your flights, accommodations and vehicle into a package deal and save on your entire trip. And that means more money to spend on dining, sightseeing or whatever you like!