The document discusses factors that can increase happiness, including having happy friends which can increase one's likelihood of happiness by 15-6% depending on the number of happy friends. An additional $10,000 in salary per year only increases happiness by 2%. When asked what makes them happy, people responded with activities like music, sailing, spending time with family and friends, relaxing in the sun, and snuggling. The document encourages visiting happstr.com to get more tips on increasing happiness.