If you want to come early or stay later there are many fun things you might enjoy doing:
Kayaking - https://www.lopezkayaks.com/
Golf - There is golfing on Lopez island. http://lopezislandgolf.com/ or you might like to come early and visit another island. Friday Harbor island https://www.visitsanjuans.com/account/san-juan-golf-tennis-club
Biking: There are nice bike trails on Lopez Island. Here are two places that rent bikes, https://villagecycles.net/ and https://www.lopezkayaks.com/
Check these links for top biking suggestions and a biking map.
https://www.visitsanjuans.com/itineraries/top-biking-experiences-in-the-san-juan-islands https://www.visitsanjuans.com/lopez-island-bike-map-pdf.pdf
Shopping: Head toward the village for organic groceries, picnic supplies, and fresh baked goods. Shop for locally made art, from paintings to jewelry, or fiber arts that make the perfect gift. https://www.visitsanjuans.com/lopez-island-shopping
There are some fun bars and brewpubs on the island. Brewvado Tap Room Bar https://cyrusramsey.com/places/brewvado-tap-room/ Open until 7 pm
Tiki Lounge at the Islander Resort https://lopezfun.com/islander-bar-grill/ open until 9 pm
Wine Tasting - there are vineyards on Lopez Island. https://lopezislandvineyards.com/
Tree Canopy Climbing -Seize the rare opportunity to climb some of the tallest trees in the world on this canopy tree-climbing adventure at Deception Pass State Park. This 4-hour, small-group outing offers the unique perspective of a monkey or bird, swinging through the open air, catching branches and climbing to breathtaking views. All necessary safety equipment is included. https://www.tripadvisor.com/AttractionProductReview-g58572-d11763718-Tree_Canopy_Climbing_on_Lopez_Island-Lopez_Island_San_Juan_Islands_Washington.html
General Information about the San Juan Islands. https://www.visitsanjuans.com/what-to-do
Lopez Island calendar of events https://lopezisland.com/calendar/