Colorado is rolling out a new ad campaign to encourage visitors to socially distance and wear masks if they decide to vacation here, asking tourists to be responsible.

Gov. Jared Polis debuted the educational videos during a press conference Wednesday, in which he also encouraged Coloradans to keep their Fourth of July celebrations small and avoid large crowds.

“We really don’t want the celebration of our nation’s birthday to be a setback for our economy, a setback for our health...