If you're looking to get out and adventure, there is a local river with some rafting. It may be a little cold, but doable!
Vail ski resort is about an hour drive north of Buena Vista if you want to get out and do some snow activities!
A short drive south in Salida is a wine tasting shop.
It's Colorado. There's mountains and hiking all over, near the wedding venue to explore. Maybe even hot springs!
Horseback riding is just a short drive south. You can book your ride through their website.
There's ATV adventure parks just a few miles west of the venue to checkout.
If you're looking to do a fly fishing charter, these guys can take you out right from Buena Vista!