Change It Up:
How much honey/sugar? It really depends on how ripe and sweet your mangoes are. You don't want it to be overly sweet where you can't appreciate all of the flavors. Start with less and adjust up as desired.
If you don't have plain yogurt, substitute vanilla yogurt and cut your honey/sugar down to 2-3 tablespoons (or eliminate completely).
Substitute strawberries for the mango.
Dress it Down:
Eliminate the cardamom for a simpler smoothie drink.
Eliminate the heavy cream. You can add a little extra milk, if desired.
Eliminate the ice for a thicker finish.