It all depends on where you want that relationship to go. If it is just a fun relationship, then you do not have to put in so much effort to make things spicy, but if you feel that this is a relationship you would like to take to the next level like marriage, then it is worth working on. You would want to spice it up to greater levels to bring out the best in everything. first i would say, get to know what each one of you wants in that relationship, be open with one another, no secrets. knowing what each one of you anticipates or expects of the other , is the best thing ever. because that will make you both work towards achieving what the other wants. i think that is exciting you will see what that does to your partner and when you see him or her smiling while you do what they expect of you, it will be so fulfilling. Take fun trips together for good memories, take pictures and make memories that you will cherish together for the longest time. leisure drives also spice up relationships, something as simple as that, can bring both of you so close, it'a amazing. Take lessons of something you both are interested in and something that you know you will be doing together even in old age. Something like cooking, riding bikes, dancing just to name a few are some of the activities you can get involved in. Am sure some of this tips will help you.