I've flown with ADP a couple of times. Make sure you understand the procedure for pickup at LAX or you'll spend many hours waiting and looking for the person collecting you.
Where to fly? Just about anywhere. We did Big Bear (great fun), Grand Canyon (stunning), Meteor Crater and Sedona (awesome), up the coast to Monterey (beautiful), and across lots of desert because I love deserts. My favourite place to be on the ground was San Diego. If I were starting again, that's where I'd live.
The air museums are brilliant too - we did several. Palm Springs and Santa Monica probably my favourites.
I tried to do an IR at ADP but that was a few days after 9/11 and a bit off-key. I went to NAC in Florida the following February and finished it.