I'd recommend getting there midweek if you're looking to get a first-come-first-serve spot and then you can stay more than one day as long as you already have your spot.
They have a few first come first serve spots they give out at 3pm. You can extend once you get one.
There is a lot to do around there, three days seems like a lot just for Jalama. They have a website you can reserve on though for however many days you want.
Most likely yes but call first
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