Sure, here are some indoor activities that you can do:

1. Board games - gather some friends or family and play some board games. There are many classic games to choose from like Monopoly, Scrabble or Risk.

2. Cooking and baking - try out new recipes and experiment with different ingredients. You can even challenge yourself and try out some exotic cuisines.

3. Arts and crafts - get creative with some art supplies and make something new. You can paint, draw, or even start a new knitting or crochet project.

4. Movie or TV show marathon - binge-watch your favourite movies or TV shows for a cosy day in.

5. Indoor exercise - there are many workout routines that you can do at home, from yoga to bodyweight exercises.

6. Meditation or mindfulness - take some time to focus on your mental health and practice meditation or mindfulness exercises.

7. Reading - curl up with a good book or browse the internet for interesting articles and blogs.

8. Virtual game night - host a virtual game night with friends or family using video chat software like Zoom or Skype.

9. Virtual museum or art gallery tour - take a virtual tour of famous museums or art galleries around the world.

I hope these indoor activity ideas give you something fun to do when the weather isn't favourable or you just want to stay cozy indoors!