This thread has been around for a long time, but I'll chime in. I like to read (historical fiction, fantasy, Sci Fi, biographies, some classics), golf (I suck, but it's great practice for patience), video games (although I haven't played a single game in about 8 months- does it still count?).
I became obsessed with my aquariums over the last months. Now, however, things are settling down- not as much research, etc. needed as before. I am biding time looking for the right moment to announce to my wife that I'm going to build a 29 gallon reef tank in the office downstairs, but that's going to take awhile LOL.
In the meantime, I'm looking for something else to dive into. I've been losing weight (63 lbs so far) and I've told myself when I get to 280 (I'm tall, but was working on getting just as wide) I will buy a gravel road bike- I rode quite a bit in my younger years- really enjoyed it. So, that's one, but it's a few months away.
I have also considered picking up crocheting. My grandmother taught it to me when I was a kid- it was a way to keep me quiet LOL. When my Dad showed up to pick me up (we stayed with Granny for 3-4 weeks during the summers), he was horrified that my grandmother had taught me crocheting (different times then, folks). He didn't say anything, though- I found out years later that he asked her, "what are you teaching my son?!?" Anyway, I kept at it for about a year, but there's only so many things you can do with granny squares. My wife told me that crocheted clothing is back in style, so I thought it would be nice to pick it back up and do something for her. After all, it would keep me quiet

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I will say that my recent obsession with the aquariums really woke me up to how important it is for me to have something new and exciting to do. I get bored easily and when I get bored, my mind wanders and that is not good for me LOL.
Ok- ramble is over.