I would head to the ranger station off of highway 1 and go on the pine ridge trail. You will be treated to massive gorges and mountains. Redwoods everywhere, they are actually scattered high mountain redwoods that suck up the coastal fog, really unique forests. There is really no place in the world looks like Ventana.
The most popular destination is the Sykes Hot spring along the Pine Ridge Trail. If you want to check out the hot springs, I highly recommend against camping at Sykes Camp. It's a boring and overly crowded place to set up camp. I went there in December and the every single flat spot was filled with people. On the other hand, Barlow Flat is one of the best camping areas I have ever seen. It's usually pretty empty, maybe a few people at times. Very flat are with massive redwoods and large areas to set up. It's right next to the Big Sur River.
There is also Ventana camp, which is not marked and the trail is unmaintained to get there. It's a nice camp though, if you don't mind wandering down some slightly confusing switchbacks and brushing up against prickly plants and poison oak. It's the most likely camp to have nobody in it.
If you keep hiking the trail past Sykes, you end up towards the pine ridge area, which is higher elevation with pine forests. I haven't been up there yet.
If you are feeling truly adventurous, you can hike up the big sur river. The big sur river is very, very calm and safe. You basically wade up or downstream. You will encounter some amazing natural features and pristine ecosystems that very, very few people have ever seen. There are some perfect little banks with sand and redwoods and perfect swimming holes that have no signs of people ever camping there. BUT, you will be forced to swim at times and it's impossible to exit the river area (steep, rocky cliffs and mountains all around). You can only do that safely in warm weather.
There is also the Ventana Double Cone hike, which I have not done yet but want to. In the winter the high mountains and ridges can get snow, which is very unique for a coastal area.