Last couple of times I've been out there, I've been bored to tears. Hopefully that didn't happen for you.
17/35 is currently NOTAMed as restricted to 12,500lbs and below, so any good traffic is not very likely at "Viewing Area North," unless you want to catch the ramp traffic for Terminal A and the Mesa gates.
Quoting F4wso (Reply 8): The P-2 and P-3 aerial tankers were busy. That viewing spot could be a good place to see them in the afternoon light.
Most areas mark the arrival of spring by blooming flowers and birds singing, we get slurry bombers! I haven't been to that spot in a very long (10+ years) so I'm not sure, but heat haze may prevent photography.