The blueberries are just starting to ripen up for the season (typically ripen around fourth of July weekend). Definitely an experience worth having as freshly picked berries are so much better than anything you can buy in the store- Sweet and tart flavors combine nicely.
As a recommendation I would say that it's a good idea to pick three times the amount of berries that you'll need. Allow the berries to sit over night and ripen and then take the berries that you won't be eating or using in the next 3 to 5 days and freeze them (or make jam) so that you can enjoy their flavors all year round straight from the convenience of your house! (Frozen berries make great additions to cereal and oatmeal and cook perfectly in a pie or muffin...)