Atlanta Botanical Garden:

https://atlantabg.org/calendar/family-led-fun/.

The Greater Des Moines Botanical Garden scavenger hunt online:

https://www.dmbotanicalgarden.com/wp-content/uploads/2020/06/Summer-2020-Scavenger-Hunt.pdf

Dallas Arboretum: 

https://dallasarboretum.imgix.net/wp-content/uploads/2020/07/06145341/Johnson-Guide-and-Book-List.pdf

North Carolina Botanical Garden scavenger hunts: https://ncbg.unc.edu/home/not-stuck-inside-for-kids/

Selby Gardens, go to "self-guided" activities at this link:

Rockford Park District: 

https://rockfordparkdistrict.org/activity-boxes

Minessota Landscape Arboretum, summer boxed kits/camps:

 https://www.arboretum.umn.edu/ActivityKitsToGo.aspx

Wave Hill self-guided avitivites:

https://www.wavehill.org/discover/virtual-wave-hill/self-guided-activities

Lewis Ginter acitvities for kids, including virtual storytime:

Free nature journaling resource:

https://johnmuirlaws.com/journaling-curriculum/