About Rubicon Adventures

Meet the Team

No “Cattle Boats” – We specialize in small groups.

Rubicon [ru-ba-kan]: To cross or pass, to take a decisive or final step, especially at the outset of some undertaking or adventure.

RUBICON is a family run Sonoma County company that has been running rivers since 1971. We started our SUP operation in 2008

Rubicon is established and operated by experienced, professional guides, certified instructors.  and have a 100% safety record in both Rafting and Paddle boarding.

Meet The Rubicon Adventures Team

Greg Isreal, our Rafting Operations Manager
Greg, an ace mechanic and top notch river guide, has been with Rubicon over 25 years, and his rafting experience is second to none.

Greg manages our rafting program on Cache Creek, the Eel river system and Trinity River.

SUP Team

John Hadley, Lead instructor
Elite  pro racer, “Red Bull Heavy Water” competitor and world class big wave surfer. In his SUP competitions he is usually first in his category and one of the top “all around” competitors in the world.

John teaches SUP Surf, Down Wind and all the advanced SUP clinics and well as being the most sought after instructor for all our classes and clinics. John is ACA certified SUP instructor, Open Water Lifeguard certification and Swiftwater Level IV certified.

Arline Thomas, Rubicon’s Yoga Master

Arline, is a retired Special Education Instructor at Sonoma County Office of Education and an active community volunteer. She is a PSUPA certified SUP instructor and is considered one of the top SUP Yoga teachers in the business. She is a major player in the Rubicon family. Arline is certified in several yoga practices as well as CPR and First Aid. Her classes are not only relaxing and informative but also lots of fun!!

Bill Mashek, Owner of Rubicon Adventures

Bill started running rivers commercially as a teenager. His rafting experience is international and has run rivers all over the world, including several first descents.  Bill Mashek started Rubicon Adventures in 1972 in the beginning of the Golden Years of Rafting.  In 2010 he introduced Stand Up Paddleboarding to Sonoma County making Rubicon a leader in the paddle sport industry.

Bill is ACA and PSUPA certified SUP instructor, PSUPA Instructor Trainer, Open Water Lifeguard certification and Swiftwater Rescue Level IV certified. With his wife Stephanie, is Co Owner of Mobile CPR and First Aid, a BLS training center.


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    Rubicon guides are well compensated and do not expect tips. However, it is customary in this industry to “tip” guides, especially if you feel your guide has contributed substantially towards making your trip exceptional.

    What Our Customers Are Saying About Their Rubicon Adventure

    Great experience. I was uncertain about taking on this activity but game to try. The instructor “John” was thorough and careful with the introduction instruction activity on dry land. When we put in the river John was attentive and provided continuous instruction and encouragement.

    It was a perfect day on the Russian River at Wohler Bridge. We paddled up river for about 1/2 the time then stopped for rest and snacks (watermelon, cookies) and lots of talk about surfing, beaches etc.

    The trip down was somewhat easier and quicker again with John offering tips and training as we went along.

    A big thank you to the Rubicon group for this experience.

    I will use their business for further training and adventures.
    – Pengdahu

    Our family had the best rafting trip ever. Thanks a ton for the memories.
    – Brandon F.

    Hola Bill!
    You’re the best of the best. Sorry I’m still catching up after my three weeks away. I keep of thinking of that wonderful class and how much I learnt. You’re a top instructor and I really hope to see you soon.

    Thanks for the fun pictures.
    Take care,

    The Highlight of Our Summer!
    My wife and I and our two kids (10 & 12), did the SUP 101 Wohler Bridge Tour and it was absolutely incredible! Bill was a great instructor that got everyone up and paddling in no time. That part of the river is so beautiful and undeveloped that you really felt connected to the nature gliding on the water. Everyone can’t wait to do it again. Highly recommend it!
    – Matt S.

    The absolute Best SUP yoga class I have ever been too.   Arline is great; she is very informative, fun and non-intimidating.  I highly recommend her class to anyone at any level. 
    – Jenna R.

    Russian River SUP, SUP rentals, SUP Tomales Bay. SUP lesson, Wine Country SUP, Paddleboarding Sonoma County.

    Whitewater Rafting Specialists Since 1972 • Stand-Up-Paddleboard Classes & Tours, Multi-Sport, Adventure Travel