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A dabbler; a dilettante; an amateur.
A "renaissance" man/woman, a polymath, a jack/"Jill" of all trades, someone who is well-rounded.
A dating site may be chosen for someone who doesn't know many people in the area where they live. It may ask for some of your interests and match you with someone with similar interests.
Because so many parties have different interests that are comperting for.
A factotum describes a person employed to do many different kinds of work.
an idea that is supported by many different experiments
he would want to meet someone who has a great personality and together have many of the same interests
smart A polymath is someone who excels in many subjects
an idea that is supported by many different experiments
A
synchronization
There are so many different summer camps for so many different interests. Check out www.teensummercamps.com for ideas and camps your son may be interested in near you.