Can someone give me a shuttle service how-to?

My dream is to get married in the redwood forests of Northern California. Luckily, I live in the SF Bay Area, so that’s a possibility.

All of the venues I’m looking at are about 2-ish hours outside of SF (where my FW and I and most of our friends live) and anywhere from 1-3 hours away from our local guests (we have family all over the bay). The majority of guests will also be traveling from outside of the Bay Area (my FW’s family is mostly in LA, and I have family and friends all over the country), so a hotel block is a no-brainer.

I’ve started looking into hotels near the venues we’re considering, and because we want that beautiful, secluded woodland vibe, the closest hotel to any of the venues is 30 minutes away. FW and I both have a lot of older family who won’t be comfortable driving windy forest roads at night, and a lot of younger family and friends who’ll want to drink well into the night, and I can’t imagine that Ubers are plentiful up in the mountains.

Does anyone have experience with contracting a shuttle service, especially for a medium-large wedding (150+)? How much did it cost? The numbers I’ve been seeing in some preliminary research are scaring me. I’m worried I’ll have to sacrifice my woodland wedding dreams for the safety of my guests.