Here's one that took a little investigating to figure out for sure what I had. The home owners that we currently rent from thought this was prickly pear. Well, that is incorrect.
Although prickly pear does grow on Maui, it is a cactus, not a fruit from a tree. Anyway. What we have here is a Soursop. Although trying the soursop is on today's agenda, I have yet to try this interesting fruit. After some Internet investigating, I found that its flavor is described as a combination of strawberry and pineapple with sour citrus notes contrasting with an underlying creamy flavor reminiscent of coconut or banana. Either way, many of the people familiar with the soursop say it makes great drink, specifically smoothies. Others say it is really good alone. I figure I will try both. I am very excited about this one.