Does it need to start and end at the same place? If not, I would recommend starting at the beach, riding up State Street, winding over to Gibraltar, up Gibraltar, across Camino Cielo, down Stagecoach, then the 154 to Solvang and/or Los Olivos. If it needs to be a round trip, you would probably need to head back around this point. If not, there are a lot of cool routes you could take around the Santa Ynez valley area. If you want to make it really epic, you could go up Figueroa mountain and you would have over 12000 feet of climbing...