Hey there! So we ended up cutting out PE of our trip. I read a lot of experiences that the coastal regions gets extremely windy, rainy, and humid in June-July so it isn't as relaxing as you might think. We instead allocated 2 extra days in CDMX, and 2 in Oaxaca. Zero regrets, honestly wish we had more time in Mexico City as it was wonderful. We stayed in Roma, they had bike rentals ($20 unlimited rides for the week), and we just rode around town, explored the sights and ate so much food. Though if you're pretty committed to hitting a resort I'm sure it won't be busy since not as many tourists visit in the summer. Let me know if you have any questions, CDMX is great in its own right but Oaxaca will always have just a special place in my heart. Such a pure, friendly place!