When I packaged out in 2019 HR was not really organized to give advise. But, if allowed let me give some points to assist.
Roxanne Shultz is a wealth if information in HR, make her your contact SHE HAS THE ANSWERS
Most likely if you package you will be in the 39% Federal Tax bracket in 2020 on your 1 1/2 salary, PTO, stock options, 24K medical. So don't spend hold back 40% for your taxes. NO CORVETTES
Get with your tax man so you don't pay a penalty for underreporting in 2020.
If 66 or at your legal retirement age and I doubt there are any . 66er's left apply for Social Security Parts A and B don't delay if after 30 days there is a horrible penalty.
Look at Medicare options quickly, 30 days. COBRA is not recognized as medical insure by Medicare.
COBRA for one month one person is around 900.00, so take care of your health and don't get sick
Get very familiar with the HSA website how to move money, get money and submit invoices.
Make contact with the woman in Legal that does the stock options or payments to you paycheck.
Get your company mobile phone and contacts transferred.
Contact PNR life insurance and extend your whole life or other with them for coverage, will save you $ if you are over 50.
Work your last day at PNR, NO CLAP OUTS, and then take two weeks off to read, travel and get your head screwed back on.
Last day hugs all your friends that are leaving with you, plan a reunion in 5-10 years, and don't ever look back in your rear view mirror. THE PATH IS FORWARD