Yes, just not more than 10 people right now!
Depends on what you mean by "by ourselves". It's a public place with benches around the cross. So they'll be other people there. There's also the amphitheatre with loads of seats.
Yes sure, it's a public area and as long as you don't litter. Enjoy the beautiful view and the fresh air.
Yes you can! Many people drive to the top and eat in their cars as well
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