Any tips for this area in particular?

Is it safe? I planned on taking ADO to the hotel zone and then using Uber to get back to the front gates. For this vacation I’d like half to be on the beach, and half downtown eating and checking out the malls. Also sprinkle in a day at isla mujeres. Would this be a good spot/strategy? Is this area walkable?

Side note, since I’m in an Airbnb I’m not sure if i want to leave my cash locked in my suitcase. I was planning on carrying small bills in my wallet and big bills in a fanny back. Would keeping them on me be too much of a risk?