I went in 2013 and again in 2015. If you’re willing to spend the money, there are 4 package tours a day, Stonehenge, Bath and the village of Laycock. They visit Stonehenge before the monument opens and after it closes (two tours each) and you get to go among the stones. They don’t let you even touch them, though. I thought it was worth it.
Usually, tours will go to Bath & Stonehenge. I’ve been to both. Bath several times. Nice day trip from London.