Take a bike tour of Honolulu. Not great training, but we enjoyed it very much and you’re on a bike all day. Check out trip advisor. There’s a beer lovers tour now, several Diamondhead options too. Wife and I did it and had fun.
Bike Tour Hawaii with Kelly was the one we used and enjoyed.
Wife is not a cyclist like me, but we do a bike tour almost everywhere we go. Honolulu, Sydney, Adelaide out to the coast, New Orleans… fun stuff.