I never had trouble figuring out what to do on the weekends when I was working. They were always too short for me!
Now that I'm retired, I do a lot of those same things. Honestly, this is my 8th year of retirement and I haven't been bored yet. Also I have not felt like a bum for enjoying some well earned leisure in this last part of life, after half a century of working so very, very hard when I was younger. It's nice to be able to decide what I want to do with my time now. I go to the gym, play video games, listen to podcasts, spend time with loved ones, read interesting articles, manage my finances, and more. I'm constantly finding new activities that I always wanted to try and new interests to explore, and now I can. Today I sent my first text message on my phone, and so did my boyfriend so we have something new to share each day. We'll never fall into a rut because we are both adventuresome and like to try new things (even though we don't care to travel).
I hope you can figure out what you want to do in retirement. Lots of good suggestions in this thread.