Generally, what makes me happy are simple things. Riding a bicycle on a sunny day, listening to the music, having a smoke.
Seeing someone smile to me always makes me feel better. Just that, meeting someone who is positive and gives off a good vibe.
Honestly, not much else apart from that, though I have some plans, some dreams to pursue (my biggest dream is to do BASE / wingsuit BASE jumping, the thought of doing something like this always makes me feel good, gives me something to look forward to).