Colombia travel itinerary. Possible to hit Cartagena, Santa Marta, and Medellin?

So I will be starting off in Cali Colombia going with my girlfriend. So I planned on starting off going to Cartagena for a few days. 2-3 is what I’ve gathered would be a good amount of time to see the city , go to an island, party.

Then from there go to Santa Marta for about 2 days. One day to go to tayrona and another day to see and party in Santa Marta.

Has anyone ever been to Minca ? Would it also be cool to see and sleep over in the hostel in minca?

After 2 days and possible one in Minca I would like to go to Medellin for about 4 days before returning to Cali.

Does this sound like a good plan? Can anyone help or give advice I would greatly appreciate it