There are a couple of ways to get down to your spot on bike.
I ride a Yuba Mundo Cargo bike. I usually have the kids on the back I can take up to 200kg on the back and 80kg on the front.
The only problem is with locking it up at your spot and taking more gear. When the wind kicks in and you need another size.
Yeah when its windy peddling is a hassle. When we are on holidays its great. Getting car parks at beaches is a hassle. I usually take it right up near the spot I am kiting.
Its good even with a SUP
I am thinking of getting a trailer for it like a quiver caddy when we are away. Thats the problem when kids want to come to the beach.
I could make one up myself but it would be ideal if it folded so I can get it inside the car or caravan.
There are heaps of ideas online. The best ones are the simpliest.