Colombia. Medellin, Jardin, Minca

Hi I'm planning a 3 week trip to Colombia. I am going for relaxing rather than squeezing a lot into my trip, but I do wonder if I am lingering too long in certain places.

I am flying to Medellin to spend 1 week and will do a little Spanish school during that time. Then I plan to go to Jardin for 5 nights. I was thinking 3 nights in town, and 2 nights a little out of town in nature. What do you guys think about that?

Then I am going back to Medellin a couple of days before flying to Santa Marta, where I will stay 2 nights, and then go to Minca for 5 nights. I have heard really mixed opinions of Santa Marta and Minca. What do you guys think.

Before I fly to Santa Marta, is there something else I should do as a. base from Medellin? I want to go to Guatepe, but it seems annoying since Id have to get back from jardin, stay a night, go to guatepe, stay the night, back to medellin, stay a night, before flying to Santa Marta. I like to stay in one place longer.

Am I going to get bored staying in Minca and Jardin for too long? I am very happy to go on walks through town, read my book on my balcony, etc but am a making TOO much downtime for myself.

Edit: should I go to bogota for a few days before and fly out of there? I usually don't live big big cities, but i do like museums and good food! skip it or add to itinerary? less days in minca and add Villa de Lleyva?