On your second day, you might enjoy experiencing the great outdoors the Denver Metro Area has to offer. You can choose to take a guided mountain expedition into Rocky Mountain National Forest or you can get a hiking map and set out on your trek yourself, though if you do this make sure you have a partner and some reliable form of distance communication for emergencies. Pack a lunch to go and enjoy your day hiking the beautiful wilderness trails, rent a mountain bike to ride, and take part in a guided pack trip on horseback. You might even consider tent camping at one of the public campsites in the forest.