Sierra Meadows Ranch is a short term boarding facility offering access to miles of trails through the Sierras. Open during the summer months in Mammoth Lakes, California, the ranch is nestled between Mammoth Creek along its northern and eastern edges and the wide open terrain leading to the base of the towering Sherwin mountains to the south. Facing west is an unobstructed view of the entirety of the Mammoth Mountain.
sierrameadowsranch.com

Accommodations for horses and people, we offer horse stalls (12\’x 24\’, to 36\’x 36\’) rented by the day, week, or for summer long stays as well as cabins on property for the people to stay in as well. Located right on the edge of town, people can also choose to stay in a nearby hotel or rental, or the nearby Sherwin Creek Campground :
https://mammothtrails.org/destination/57/sherwin-creek-campground/#mapTab

From Sierra Meadows you have access to Mammoth Creek Loop:
a short, hour long warm-up to the area
https://www.mammothtrails.org/experience/96/equestrian-trail-riding-mammoth-creek-loop-at-sierra-meadows/#overviewTab

Sherwin Lakes Trail and Valentine Lake Trail:
https://mammothtrails.org/trail/34/sherwin-lakes-trail/

Hiking Just Outside of Mammoth Lakes

https://www.mammothtrails.org/trail/41/valentine-lake-trail/

As well as Mammoth Rock Trail, which will lead you to endless more trails in the Lakes Basin, and access to the backcountry!
(The Lakes Basin area trails are multi-use trails)

Here is a link to equestrian trails in the immediate area just a quick trailer ride from Sierra Meadows.
https://mammothtrails.org/activity/34/equestrian/