Have you already priced out a car rental for two days? I think those bus tours tend to run about $60 per person (but please call to confirm because I am not certain). If the car rental price is obscene and more than the price of the two day trips, then just do the bus tours. If, however, the car is a steal, then I'd go on my own. The LA tour, however, is probably more convenient, unless you have a great GPS and/or are familiar with LA. It might be more of a headache than it's worth to do that tour on your own.