Combine sugar, salt and lime zest on a plate. Run lime along rim of glass and press into sugar salt mixture. Fill glass with ice.
In a cocktail shaker, combine tequila, triple sec, lime juice, agave and coconut cream. Add ice, cover with lid and shake for 30 seconds or until shaker is frosted.
Strain margarita into glass and garnish with a lime wedge and optional lime zest.