Itinerary help: Best way to break up the journey from Vinales to Trinidad?

Hello, I’m planning on visiting Cuba in March on a 12 day trip. The places I’m most keen on visiting are Havana, Vinales, Trinidad and Varadero.

I start to feel quite sick on long car journeys so would like to break up the route a bit to avoid being in a car for over 4.5 hours.

So I thought this could work as a route:

Havana (4 nights) > Vinales (2 nights) > Playa Larga (1 night) > Trinidad (2 nights) > Varadero (2 nights)

Is Playa Larga the best option breaking that long journey from Vinales to Trinidad?

Would it be better to go back to Havana rather than Playa Larga?

Are there even many taxi or tour bus options that go directly from Vinales to Playa Larga?

Appreciate any guidance! Thanks.