Read a book! But here are some other worthwhile activities…
Worthwhile Screen Time
Here is a giant list of animal webcams
Hidden Worlds of the National Parks – park rangers take you on tours of rarely-seen parts of the parks
Join a citizen science effort at Zooniverse – identify and count animals at watering holes, measure the movements of stars and planets, identify antibiotic-resistant bacteria, or any of the hundreds of interesting projects you can volunteer for.
Google Arts & Culture is an amazingly rich site – watch penguins tour museums, search for art by color, get virtual tours of museums and historic sites, use your phone to play with art, and so so much more.