Weather should not be a major limiting factor, as the forecast for the region is increasingly warmer. Beautiful day on Sunday, better day on Monday.
A trip up on Trail Ridge Rd on a Monday will be less crowded than it would be on a weekend. You could also take the trip up to Bear Lake, since it's likely to also be less crowded than weekends and is worth the drive up. You can take an easy hike around Bear Lake -- it's only about a mile around and is very easy and beautiful. You could also take a hike to Alberta Falls, again an easy hike of ~2 miles round trip. You could also take a ride on CO 7 and take a hike around Lily Lake, which is just a few miles outside Estes Park, or you could drive just a bit further and go in to Rocky at the Wild Basin entrance and take a hike to Calypso Falls. All are very doable on a beautiful fall day!
2007 GMC Sierra SLE 3500HD Dually
2016 Coachmen Catalina Legacy Edition 243RBS
2007 Keystone Outback 25RSS - R.I.P.