Nice partially shaded trail! It took less than 2 hours RT and we stopped at the canyon for about 15 minutes. Only disappointing thing is that Red Rock Canyon is the destination, not really part of the trail, so sadly you don't get to walk through the beautiful formations! Parking is $3 at the lot at Portola/Market next to Arco. Where Borrego Canyon Trail ends, make a right towards Mustard Road and you will soon see the markers for Red Rock Canyon trail.