The very top tips of my ears are a little red but still not burning.
I am tan but I’ve burnt every year even with caution and lotion… so this is great.
Lots of exercise - yes. Wifey and daughters are beach bums most of the time. This means daddy has to carry, pull, push all three. Wifey has a giant inflatable orange chair that needs to be pulled around wherever the fish are. She’ll look down - that’s about it. 
Youngest is 8 and sees me as a seahorsey and needs to be carried all over the water… occasionally crying about the salt spray but insisting she’s having fun.
Oldest is 12 and she’ll actually come snorkeling on the reef with me… she puts the effort in but she also gets jealous of the 8 year old and wants to be babied… so I do horseyback rides with 105lb pre-teen sometimes… also - occasionally inherits wifey’s “carefree” genes where I need to play tugboat and pull her all over the place on her inflatable chair.
Yesterday, she wanted me to carry her in my arms and walk down the beach for “exercise”…I lasted about 40 feet … she’s 105lbs! Her argument is that I lost 95lbs so this should feel about the same as normal walking a few years ago… darn logic! She’s a talker all right.
So tons of exercise… if I had to make a bet, I’d say closer to 4000 calories a day from 6am to 6pm… and my body is fueling it with glucose and ketones. I am trying to stay as carnivore as possible (darn almonds yesterday) and keep my protein up.
To be fair, some of these activities are very HIIT. We saw a school of Atlantic blue tangs and needed to keep up. There was no option to take a breath or they’d be out of sight. So it was literally “flight” from fight or flight… chest burning, arms on fire… legs nearly numb from the exertion… and we kept that up for nearly 5 minutes all out.