R3 Athlete Performance (LI Diamond Baseball) in Holtsville runs the Quad City Summer Camp, a weekly baseball and softball camp for boys and girls ages 5-13. Campers work on hitting power mechanics and hand-eye coordination, play live games to build baseball and softball IQ, and do speed and agility work. The camp is held outdoors at the Quad City Alliance of Leagues sports fields, convenient to the Smithtown, Brookhaven and Islip townships, at $180 per week with a $150 early-bird rate. The organization also runs an indoor training facility with private lessons, clinics and cage memberships.
The practical details
We list only what the camp itself publishes, and programs change — dates, prices, ages and availability can all move after we check. Confirm the details on the camp’s own website and contact R3 Athlete Performance - Training Facility directly before you register or pay. Last checked August 2026.
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★★★★★Denise BuhrauGreat facility! The cage membership was absolutely worth it. The place is spotless, well-maintained, and the staff is incredibly attentive and helpful.
★★★★★Jimmy ShineboxMy son plays up on 10u travel. He loves the coaches here and always looks forward to going so we sign him up frequently for lessons, camps, specials etc. Highly recommend R3!!!
★★★★★GLPThis place is amazing. It’s a great facility and spotless! Rob called me right back and my daughters had an amazing lesson with Crystal. Their exact words were, “the best lesson of my life.” And we’ve had many all over. Crystal was attentive and asked exactly what they wanted to work on. We drove an hour and 20 mins to get here and it won’t be the last. We can’t wait to go back. Thank you.
★★★★★Grace RobayoI can not say enough about R3!! The indoor clinics have been something my son looks forward to. They have a lot of staff helping so not only is it safe, but the kids are building their skills and having fun! The baseball camp over the summer was one of my sons best summer memories this year! He grew so much as a player and the time and attention given to each kid there was really special!
★★★★★Bridget TitoneLove the dedicated staff who have a strong work ethic and desire for every athlete to meet their full potential. Personal attention given and strong commitment to the highest standard of customer satisfaction. Couldn't recommend the facility more!.