Sometimes I make simple syrup using a 2:1 ratio, 4 cups sugar to 2 cups water. This gives you a higher concentration of sugar meaning you use less to sweeten beverages, but this takes a bit longer for the sugar to dissolve. Either way is fine, it’s really up to you.
By the way grown ups can add a shot of rum to the lemonade for a frozen cocktail. Add the rum at the same time as the other ingredients and blend before adding in ice cubes. Trust me it’s delish! I’ve been doing this for years for me and my girlfriends, but we call them Mango Daquiris!