Resort Boin is an amazing hentai if your looking for beautiful girls and great sex scenes.
The story isn't complex or that amazing since it's a hentai (but who cares about that). Basically we have this guy named Daisuke who goes on vacation to some island resort. Just like any other hentai he ends up meeting all kinds of girls and making love with them. The girls include his cousin, a surfer, a rich girl, and more characters.
The girls and sex are obviously the best part of this OVA. All the girls all feel different in design (except for boobs, most of them have oppai) and have different personalty types. There's a girl for just about anyone in this OVA. The sex scenes are great and will get most people interested, with a good selection of sex acts and hotness :D
Resort Boin is a great hentai all around and should be seen by anyone who wants to see some cute anime girls getting it on ;)