Pegscraper is correct about Santa Rosa.
If you decide to ride from Skaggs Springs Road back to the Hotel I can suggest a route or two that are a lot of fun while avoiding the freeway. (This is my backyard, we live 5 miles west of Sebastopol).
I recommend looking at; Skaggs to Dry Creek Rd, 101, to Westside Rd, West on River Rd to Monte Rio, turn south on Bohemian Highway through Occidental to Freestone (try the bread in the woodfired Wildflour bakery, I'm addicted to the Fougasse!), west on Bodega Highway, left/south on Valley Ford/Freestone Highway, left/east to the town of Valley Ford, right/south on Valley Ford/Estero Rd, left on Dillon Beach Rd to the town of Tomales, right on 1 and left on Tomales-Petaluma Rd, right on Chileno Valley Rd, right on Marshall Petaluma Rd, left on Wilson Hill Rd, right on Pt Reyes-Petaluma Rd, left on Nicasio Valley Rd, left on Lucas Valley Rd to 101. A lot of these roads have almost no traffic, great views and lots of curves.
What time do you plan to ride from the Larkspur Hotel?