Mental vs. physical
Well, I had typed this hopefully eloquent message and our darling Kona deleted it with one nudge of her chin. Sweet girl...thank you for your help and I'm so sorry my lap was not available for your pillow and you had to resort to the keyboard.
Our Kona is only 4 months old, but since I work from home and my boss doesn't exactly want to take 2nd place to a demanding puppy, I started researching how to have a calm pup from the day we brought her home. It's a work in process and sometimes I have a wild kangaroo and sometimes I get this sleepy pile of puppy snuggles.
We do a couple of things with her (and also with our senior mutt who's body has slowed down but brain has not) that really help. Free play doesn't seem to phase her. We do about an hour walk...some meandering, some pulling and leash training still...and occassionally the dog park or playing in the nighborhood. She can do that ALL DAY LONG. And it seems the more she does it, the more she craves it and gets even more rialed up.
What I've found that wears her out is focused, structured, mental exercise. Four or five sessions of training for about 3-5 minutes at at time (she is a baby still). Sit, down, stand, spin left, spin right, roll over, shake, fetch, drop it, leave it, come...we've even invented games..she has to find which couch her ball has rolled under, etc. She seems to like learning. Her attention span is short, but whenever she gets a little wild, I break out the treats and leash and we train, train, train. Boom, she's calmer, focused and usually will go play on her own for a bit. We also don't entertain her all the time. I really want her to be satisfied in her own company. It's tough to resist her bumping my legs with a toy or demand to play, but if I can hold out, she'll usually go happily chew on something on her own. Again, she's 4 months old...I may be very diluted in hoping this will last, but I'll take it while it lasts.
She also goes to puppy class and that seems to really wear her out. All that sitting and being quiet then working. And the trainer said we can teach her "settle" where she knows to go to her place and quiet down. To do that, sometimes I put her in her crate just because...she likes the crate already and we both need a break. She will just play with her toy or chew the bone and we both get some "alone time". Not punishment at all, but I don't want her to have separation issues and that was my best guess at how to create separation since I'm home all day too.
Good luck! Hope you and Calvin find some moments of calm in that great California sunshine.