Fall is as good a time as any out here. Great weather to be active and plenty of things to do within a 45 minute drive. Just choose your direction and go.
Mason is deep in the Heart of Texas. Historic downtown with some great scenery all around. They have a nice Art Walk during the first weekend of each month in the fall.
This is the first weekend: http://www.masonartwalk.org/
Head South to Blanco where there is always something going on. This weekend is the Ladies State Chili Championship of Texas
Hit the Fall Lavender Trail - http://www.mjlavenderfarm.com/services.html
And of course: Oktoberfest. Some notable options are listed below, but there are plenty more around...just ask the locals.
Fredericksburg Oktoberfest is this weekend. Rated one of the Top 10 in the country. http://www.oktoberfestinfbg.com/
Walburg, TX has a month long celebration in one of the friendliest settings you will find. http://www.walburgrestaurant.com/
San Antonio is a bit of a drive, but the Beethoven Maennerchor has a great weekend celebration coming up.
And finally, Texas Wine Month Trail opportunities will break out all month. - http://texaswinetrail.com/
Start planning!!