Thursday, June 18 from 10:00am-10:30am

Join thousands of kids and families at aquatic facilities and waterparks around the globe for The World’s Largest Swimming Lesson™. We’re breaking the Guinness World Record™ to spread the word that Swimming Lessons Save Lives.™ For more information about the event, visit

NOTE: All swimming abilites welcome. Everyone must be registered in order to participate. Participants will be divided into groups by age. Register in person at the Lisle Recreation Center or online by clicking the link below.

Age Day Date Time R/NR Reg. By
3-16 June 18 Thursday 10:00-10:30am Free June 17

Click Here To Register Online

NEW! Youth Triathlon

Saturday, June 20 | Race Starts at 8:30am

Do you love to swim, bike and run? If so, join us for our first ever Youth Triathlon! Participants will be placed in age groups (5-7, 8-10 & 11-14) and will complete all three traditional triathlon events. Each participant will be timed throughout the entire event and prizes will be awarded for 1st, 2nd and 3rd place by age group.

AGE GROUPS: 5-7   |   8-10   |   11-14
PRIZES AWARDED: 1st, 2nd and 3rd Place by Age Group
NOTE: Pre-Registration is Required

Date Day Time Fee Reg. By
June 20 Saturday Race starts at 8:30am By May 22: $30
By June 12: $40
Early Bird Registration Ends May 22
Reg. By June 12


Sunday, June 21

FREE ADMISSION FOR DAD with purchase of a full priced daily admission.


Sunday, June 28 & Sunday, July 26 from 7:00-10:00pm

Sea Lion Aquatic Park Pass Holders, please join us for a special night in your honor! The pool will be closed to the general public and open late just for you! Bring the family for a night under the stars complete with a DJ, 2021 pool pass raffle, and food specials at Sammy's Snack Shack!

NOTE: OPEN FOR 2020 PASS HOLDERS ONLY! NO Registration Necessary.

Date Day Time Fee Reg. By
June 28 Sunday 7:00-10:00pm Free for Pass Holders No Registration Necessary
July 26 Sunday 7:00-10:00pm Free for Pass Holders No Registration Necessary


Saturday, July 4

FREE ADMISSION for Lisle Park District Residents - (Must show proof of residency)


Thursday, July 23 from 12:00-2:00pm

Beat the heat from 12:00-2:00pm with reindeer games and a visit from Santa at 1:00pm.


Saturday, August 8 from 9:30-11:00am

Put your engineering hats on...and your bathing suit too! The Cardboard Boat Regatta is a hilarious special event allowing participants to show off their boat-building skills. Join us at Sea Lion Aquatic Park for a morning of comical fun by testing the waters in your cardboard boat. Compete against other teams or come out to watch the entertainment! Prizes will be awarded. All Ages Welcome!

Prizes will be awarded for:

  • Pride of the Regatta (most spectacular boat entry)
  • Best Dressed (most creative team costumes)
  • 1st Place Race Winners
  • Titanic Award (most valiant effort to keep boat afloat while sinking)
  • Battleship Winner

*All participants are required to fill out a waiver. Download the registration form and waiver below, and email the completed form to Laura Cavazos at

Date Day Time R/NR Reg. By
August 8 Saturday 9:30am Boat Check-In
9:45am Pre-Race Voting
10:00am Races Begin
Battleship Begins After Final Race
$20 / $30 Per Boat August 4

Click Here To Register Online

Download the Registration Form & Waiver


Thursday, August 13

We will have special discounted pricing all day at Sammy's Snack Shack.


Join Us On Friday, August 21 from 7:00-9:30pm

Location: Sea Lion Aquatic Park - 1825 Ohio Street, Lisle
Get your friends together and meet up at Lisle Park District’s Sea Lion Aquatic Park. We are shutting the doors to the public and keeping it open late just for you! Our DJ will be playing your favorite songs as you swim or hang out poolside with all of your friends. There may even be a contest or two thrown in just for good measure.

GRADE: Entering 6th-9th Grade
NOTE: Register at your park district today, or you can pay at the door! Residents of Lisle, Bolingbrook, Darien, Westmont, Downers Grove, Clarendon Hills, and Woodridge Park Districts can attend. You do not need a Jr. High After Hours card for this event.

Day Date Time R / NR Reg. By
Friday August 21 7:00-9:30pm $5 Register at your park district or pay at the door!

Click Here To Register Online