Interesting Question, one you can most probably answer yourself. You and your partner know what you both enjoy doing so go out and do it together.
Every relationship hits a road bump every now and then. But there are plenty of things you can do to make things more fun and entertaining.
For example if you stay at home too much then go out and do stuff together, go for a walk, watch a movie in a cinema, go to an arcade, key is to do it together.
Another thing I find fun to do with my girlfriend is to have competitions, it's always good to have some rivaling fun.
Easiest way to get out of the "boredom" is to talk to your partner about it and focus on finding fun things to do together. It works for me.