You are from NY it says, no? I was originally from CT and moved here in 2004. If I were me in your shoes, I tell me, "Desert Museum!" Yes, it is getting hot out, but here's the thing: You guys are (presumably) on east coast time. Which means, you'll probably be waking up earlier here. The Desert Museum opens at 7am in the summer (which is WONDERFUL since it does get so hot!) so you can get there at opening time and get in a great few hours before it gets completely unbearable out and be outta there in time for naps

The desert museum is one of the most amazing places. You can see javalinas there! And mexican wolves, an ocelot, mountain lions, humming birds galore, reptiles, frogs, snakes (rattle snakes, too!!), prairie dogs, owls, fish, and then all the stuff that is outdoors while you're walking around which includes: lizards, gila woodpeckers, cactus wrens, all types of species of butterflies (go to the butterfly garden!!!) rock squirrels (which are really friendly and don't scare easily), cardinals, humming birds, etc. etc. etc!!
Can you tell I love the place?
And, as the temperature does climb while you're there, you can transition into the more shaded exhibits and airconditioned indoor exhibits.
If you want a "tour guide"

and a friend for a morning, we'd love to show you around if you're in the mood for some company!
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