Did a load of training at ADP just over 12 months ago, on both Warriors and the Seneca's. The aircraft are old, but basically sound.
Having said that, I make the following suggestions, not because ADP are bad, but because the SW USA is not a friendly area terrain and climate wise.
Make VERY VERY sure that you have all the possible survival aids over some of that terrain. By that I mean WATER, bars of some sort for instant energy, maybe a hand held comm/nav, and ideally a portable GPS or similar. Also make sure that you have clothing that is suitable for all emergencies.
ALWAYS file flight plans.
Be VERY careful of density altitude, and oxygen height limits.
Watch VERY carefully for dehydration in flight.
NEVER break into flight fuel reserves unless it's the emergency that the fuel is there for.
I did a trip out of ADP to Denver for a few days unwind, and it was great fun. It also emphasised VERY clearly that not all of the USA is heavily populated with a good wide tarmac runway within a few miles. Remember that and you too will have a good trip
Regards