My three horses and two donkeys all LOVE to go to the beach in the summer. They will happily just stand in the cool water and soak their feet for long periods of time. It's such fun for me, too.
Actually, my Welsh Pony mare Magie likes to paw at the water a lot. People try to tell me that she is going to roll but after having her for over 6 yrs, she has never tried to roll in water. I think she just loves to splash and every time makes me almost fall off her back from the belly laughs she gives me. Other than trying to go too far in our pond, and then potting her nose underwater (scary) she is amazing in the water.
Love the comment about never using a tie-down. Years back at a local state recreational area a couple went riding. They stopped at the edge of an island - like peninsula (complete w picnic tables & rest area facilities so not deserted). Horses were allowed a drink. Mucky edge. Horses went into man-made lake (with riders ). Spouse & horse drowned. I shudder every time I visit the location. These were experienced riders & adults who were not 100% aware of the drop off area & the danger of using the tie-down that prevented the horse from lifting it's head to get air.
I noticed in your breed horses that the Boulonnais, marble horse of France is not listed. I've imported a Boulonnais 4 year old Stallion. I'm very excited about him. We also imported a bred 3 year old. This is a rare large draft horse that's elegant and refined yet very sturdy. This breed dates back to 57 BC, with a breed type set in the 17 Century at which this breed type still is the norm. This breed has not walked in the United States for over 115 years. They were once a horse that was prized and their numbers were as high as 600000 before WW 1, after WW 2 they were decimated, have since numbered between 750 horses to around 1000. With so few of these horses out their I do think your readers would like to know about and see photos of them.