What is the largest economic power in the state? Tourism?
Tourism is one of the strongest economic drivers of Colorado, providing a valuable source of revenue and jobs. In 2016, 82.4 million visitors spent a total of $19.7 billion here, generating $1.2 billion in state and local taxes — an all-time high for the state.
https://choosecolorado.com/key-industries/tourism/
More detailed numbers.
https://www.bls.gov/eag/eag.co.htm