We are going to be staying at the Grand Hyatt on Welton Street in downtown Denver. The hotel wants $35/day to park. Are there less expensive options nearby to park?

I want to use transit to get from the airport to downtown, but the bus appears to only run once a hour on weekends and holidays which could result in a long wait. That is why I have reserved a car, hence the need for parking of same.

Thanks for any information.