One the most effective ways of gaining reward and happiness is to bring happiness to others. Islam teaches us to be well-wishers of others. Be merciful to those on earth and those in the heavens will be merciful to you.
Zakah is Fardh (compulsory) upon every sane adult Muslim (male and female) who possesses net-Zakatable assets (i.e. Zakatable assets over and above one's basic needs minus liabilities) to the value of Nisab (minimum threshold) for one's Zakatable (lunar) year.
It is Sunnah to visit the sick. Visiting the sick is highly rewarding, helps one to reflect and reminds us that good health is indeed a great bounty and gift from Allah Ta'ala for which we must be grateful.