Usually, car rentals are the hardest part of a trip to get outsized value with points. Right now, until June 30th 2024, there’s some interesting offers for Hertz rentals that can be stacked.
1) Sign up for Hertz Gold Rewards (free) and you get 3500 points after 3 rentals. A free rental day on a non-blackout date is 950 points, so this is worth 3 rental days. If you spend $300 you will get a 4th rental day. The free points expire at the end of 2024.

2) Amex Offers has $40 back after $150 for Amex Platinum members as part of their 40 year anniversary promotion.

3) Rakuten currently has 15% cashback for Hertz Rentals.
I do a lot of 1 day rentals, and each rental day costs $55. So, after 3 rentals for $125 out of pocket, I should get 3 free rental days and 2500 Amex Rewards Points through Rakuten. That’s about $100 for 6 Rental days, which is as good as it gets for rental car deals.