First step: check out your the Summer Recreation Guide created by your local municipality. You'll be amazed just how many options are right in your neighbourhood that you had never heard of.
Literally hundreds of different options for you to pick from. Go to this link when you have 20 minutes to start making your summer plans in Kelowna.
Glenmore and Downtown: For some reason there is a specific guide for this region of our city this summer: http://www.kelowna.ca/CityPage/Docs/PDFs//Sport%20and%20Recreation/Quick%20Guides/Summer_Progams_Glenmore.pdf
West Kelowna: Allow a minute for this page to load as its their whole summer program in a pdf format: http://www.districtofwestkelowna.ca/Modules/ShowDocument.aspx?documentid=13238
Lake Country: https://ca.apm.activecommunities.com/lakecountry/Activity_Search
Penticton Recreation Guide: http://www.penticton.ca/EN/main/community/parks-trails-beaches/community-centre/recreation-guide.html
I did some crowd-sourcing on my Facebook page earlier this week and got 30 great suggestions including anything from Cirque Camp (http://www.lakecountryschoolofdance.com) to the very impressive looking summer camps presented by Okanagan College open to any kids going into grade 2 in September (http://www.okanagan.bc.ca/Assets/Departments+(Education)/Continuing+Education/Camp+OC/2014/2014+Brochure.pdf )
If you want some more community based options or if you feel I missed one that you think deserves special attention feel free to comment on the post
Next we check out the various community or non-profit societies in town. Here is a simple list to get you started but I would highly recommend the camps at the RCA and the ECOBlast camp is probably one of the most unique options I'll share with you today:
Rotary Centre for the Arts: https://secure.rotarycentreforthearts.com/courseRegistrations/listClasses.php?categoryID=13&ageID=1 Arion Farms: http://www.arionfarm.org/farm-discovery-day-camp.html
Okanagan Regional Library: http://www.orl.bc.ca/kids/story-time/summer-reading-club
Okanagan Science Centre http://www.okscience.ca/OSC-2014-Summer-Camps-Outline.pdf
Church camps: (I'm sure there are more of these but I only found one or two during my online search):
Willow Park Church: http://www.willowparkchurch.com/events/event-registration/?ee=8
Trinity Baptist: http://www.trinitybaptist.net/#/ministries
And if you want some DYI ideas Okanagan4Kids.com recently did a helpful column on camping activities for kids: http://www.okanagan4kids.com/10-best-camping-activities-for-kids/