Those little tents belong to the terrace of the café / bar Portas do Sol. It's a great place for a drink with a view, especially if you can bag one of the sofas. It's not the cheapest place to eat or drink but you're paying for the location.
There's another terrace beside it where you don't need to pay but you may be pestered by street hawkers.
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3 day Portugal Motorcycle Tour
Nothing like a discovery short break away from the daily routine and let yourself be taken by the freedom of riding a motorcycle across the Portuguese Heart land. With this short trip we will take on a quick 3 day tour of the best that Portugal has to offer. From the coast to the heartland, you will be driving through UNESCO heritage sites, protected forests, barbecuing on the beach and even fishing your own lunch.