Our flight gets in at 10:15pm and I need to get to central Denver. I'm thinking my best option is RTD bus to Market Street Station, and then take a taxi (would be abt 3 miles in the taxi). Is it safe? (50-ish woman and my 14 year old son, from San Francisco so used to cities). By the time we got there it would probably be almost midnight - would there be taxis around at that time, or should we call on the way?