Absolutely! You probably know lots of other outdoor enthusiasts.
When you refer someone who purchases All-Access, you get $5 off your next bill and they get $5 off their current bill. And you can refer as many people as you want, which means a free subscription for you when you get four friends to sign up.
The 'Referral Code' is listed under the 'All-Access Promo Codes' in your Settings (web only).