Advice on stops between Lisbon to Algarve

Hi all, I have the front and back end of my Portugal itinerary down, pasted below. I am torn on what to do in middle, namely on day 5 and 6. As you can see below my initial plan was to take the scenic route and stop in Alentejo region for two days/1 night.

I've considered 1) making day 5 a Cascais day trip and just driving straight to Algarve on day 6 using the highway. or 2) making day 4 a day trip to Cascais, then day 5-6 an overnight in Sintra, then straight to Algarve. Other stops i've considered are Evora, though a little out of the way. Would love insight from anyone whos done a similar trip. With the four days in the Algarve, I'm interested in any suggestions that would bring diversity to the itinerary. ie Porto Covo feeling the same as Lagos would be helpful to know.

Day 1 - arrive LIS 4:40pm

Day 2 - explore Lisbon

Day 3- more Lisbon

Day 4 - Sintra day trip

Day 5 - was going to drive Lisbon to Alentejo, stop overnight in Porto Covo

Day 6 - Porto Covo daytime to Algarve

Day 7- Algarve (lagos or carvoeiro)

Day 8 - Algarve (Seven Hanging Valleys Trail hike)

Day 9 - Algarve (SUP Bengali caves)

Day 10- Algarve (another town)

Day 11- check out, fly to next destination (London)

I would say my partner and I love to do something active each day followed by some chill beach time. We come from a beach town so its not entirely novel to use, but do love a quintessential eruo summer vibe. Good food is always appreciated, but we dont really drink.

Thanks in advance!