I love talking about our tavs too, brings me so much joy <3
This will be a long answer so bear with me

For cuddle position it really depends on his mood.

If he´s feeling a bit more confident and big, wanting to take up space, then I think Felyn really loves wrapping himself around his cuddle buddy as much as possible, providing as much body heat as possible. Really just wrapping his legs and arms around, letting them nuzzle against him and into the crook of his neck, one hand tracing little patterns in their back and massaging their scalp. Just really wanting to be a source of comfort and protection for the other.

If he´s feeling.. a little smaller. Liek if he´s had a bad day or he just wants to be held. He loves resting his head on peoples chests, or like, press his face up in the spot behind someones ear to like. Breathe in the scent bc he finds it comforting, like a warm blanket being pulled over him. He´d want to curl up against someone as much as possible, using them as a big pillow he can hug and find comfort in.

He just wants to hold someone or be held by someone.

Now for a beach episode, I think he would enjoy the ocean... but he is really light sensitive and he gets sunburnt easily, So he´d be wearing the biggest sunglasses he could find, maybe even like multiple at the same time to really block out the sun. And then he´s just lathered in sunscreen, the main reason he is so blue is because that´s how he tans, back in the underdark he is more of a dusty grey XD.

He´d be the idiot who´s never tried surfing but is convinced he could do it bc "It´s just standing on a board", and he would end up getting himself hurt.