First thing to do is install a front brake. You can follow the other member and install caliper brake. You could also go banzai, install another 29" fork to accept a front disc brake.
You can also hang a caliper brake on the back wheel too.
Make really sure that your fenders are very secure.
Tires will depend upon which engine drive you choose. If friction drive, then rear tire must be smooth tread, not nobbies.
I'm in Honolulu and ride from Pearl City to Ala Moana Park.
Where are you on Oahu?