“Calvin Coconut: Man Trip” by Graham Salisbury has a lot in common with “Summer of the Gypsy Moths,” in that Calvin gets to spend summer vacation with a very special adult. In this book, perfect for kids age 7 and older, Calvin is going on a deep-sea fishing trip with his mom’s boyfriend, Ledward. This is especially great for Calvin, who sometimes feels overwhelmed by being the only male in the house with his mom and younger sister. While on the fishing trip, Calvin learns an important lesson about the natural world and respecting its creatures. “Calvin Coconut: Man Trip” is similar to “Summer of the Gypsy Moths” in one other way: In each book, the kids who are the main characters discover that family — however it is defined — is very important.