Sayulita was highly recommended to me by a Mexican when I visited Mexico. I haven't been there yet, but researched it deeply. If you want somewhere non-touristy, it seems like a great place to spend a few days.
4 Day Reiki Healing Retreat in Sayulita, Mexico to Reduce Stress and Unlock Your Intuition - Tripaneer.com
Bali seems to be on everyone's Bucket List. Not doing it solo might be more fun. And a retreat is a great way to do that.
4 Day Private Spiritual Yoga Retreat with Guided Meditation in Bali, Indonesia - Tripaneer.com
