Here are some suggestions:
Trip around the world in 30 days
90 different meditation exercises in 30 days
Fast for 30 days
Relax for 30 days
Make peace with 10 friends and 10 enemies in 30 days
Befriend 5-10 personalities you would normally avoid in 30 days
Do stand-up comedy for 30 days
Grow a moustache/beard for 30 days
No shower for 30 days
No brushing for 30 days
Sustainable, green living for 30 days
No power for 30 days
Only use bicycle for transportation for 30 days
No hot water for 30 days
Making love for 30 days
Abstinence for 30 days
Write a play for 30 days
Help the disadvantaged for 30 days
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