Biking
If your interested in exploring the area by bike there are a few bike rental services in Santa Cruz that could rent bikes to you and 2 tour operators that may offer bike wine tour packages.
You can also check with your hotel to see if they can arrange rentals for you.
If you are planning on bike riding to the wineries, just make sure to give yourself enough time to reach the next wine tour hour (most wineries here have established wine tour hours 10:30AM, 12:30PM, 3:00PM, etc).
Bike rentals
http://santacruzrentabike.com/
https://www.casa-suiza.com
http://www.naturalwinetours.com/
Most bike rentals start at $15,000 CLP per person.
The Santa Cruz Winery also offers bike rides
— Enjoy a 9 km tour in the vineyards of Lolol (in Colchagua Valley) at the main winery.
— You can add lunch or a picnic to the tour at an additional cost.
WEB: https://vinasantacruz.cl/producto/tour-en-bicicleta-vina-santa-cruz/
The Viu Manent Winery offers entertaining e.bike tours. This is a 5 km guided tour with hybrid bicycles (electric-conventional) that allows you to learn about wines while navigating through the vineyards enjoying beautiful views of the Andes mountain range and Apalta hills.
WEB: https://viumanent.cl/visitenos/tour-degustacion/#tour-con-almuerzo
Reservations are required