Check out personality profiling through Meyers-Briggs or Enneagram to see if you can determine his natural brain functions and orientations for a birds eye view of what will be motivating factors for his interests and ways he identifies with his environment.
Regardless of personality style I am huge advocate for teaching children a love and curiosity of nature, the natural world and the arts.
Load him up with art supplies, animal and nature books, films, age appropriate science projects. Personality theory is huge in determining areas of excellence with children as we are all born with innate tendencies towards how we explore and assimilate our environments.
Many NTP personalities are often seen as ADD or ADHD when, infact, they are gifted children with special needs for maximum learning motivation.
5 years old is still very young to expect a long attention span, but I strongly suggest an attempt at personality profiling to glean as much info. as you can towards providing for his individual needs and natural talents. :-)