I've booked a flight to SAC, and flight from Denver, and a train between the two, and a hotel in SAC, so far.
I'll get to Sacramento around 11 am on June 26, probably hang out in the Old Sacremento area that afternoon. What I do the next day is undecided, I haven't even decided whether to get a car or not. Rafting is still possible, there's also a place called Railtown about 2 hours away that is supposed to be pretty good. Of course, I'd need a car for that. Or a ride! The advantage of not getting a car is I don't have to get it back to the airport!