How to keep a relationship interesting/keep spark alive?

The relationship I’m in right now is amazing and I want to hold on for this guy as long as I possibly can. In my past relationships an element of complacency has crept in after a number of months leaving as both kind of unfulfilled. Of course the honeymoon stage doesn’t last for ever so a year into your relationship isn’t going to be the same as the first few months but what things can you do to help keep the spark and excitement alive? Because I’m really dedicated to making it work with this guy and he feels the same way!
How to keep a relationship interesting/keep spark alive?
Post Opinion