A couple things:
1) walk across the street to the Bellagio and tour the free gardens near the front lobby
2) KOI restaurant at PH is very good
3) PH Sportsbook is not great. Might try Cosmo, Bellagio, Aria, but get there early Sat/Sun
4) Many good places to eat at Cosmo. Check their website for happy hour deals at each as you can schedule a progressive HH at 2-3
5) I wouldn't rent a car unless you have specific destinations you want to go to off strip. PH is in a good location. Cabs are back in fashion from the airport as they have zone pricing and UBER/Lyft wait times are still high with dynamic pricing often in place. You can also jump on the double decker bus and take a ride up and down the strip for site-seeing. If you are Diamond level at CET, valet is free if you do get a car.
6) A lot of buffets are still closed if that is part of your plan
7) Nice large, ornate bar in the center of the PH casino floor. Decent drinks and good people watching.
8) Look up the PH shopping mall website to see if there are stores/restaurants of interest there. Check out Ocean One for a very good discounted lunch deal.
If you have specific questions I would be glad to try to answer. Have a great time.
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