How could it possibly be time consuming? What are you spending so much time on? Guests have access to Google, Yelp, etc. if they don’t want to just follow their nose and “be a tourist”…be adventurous.
Also, if you’re trying to offer a concierge service, most of your clients are going to be located in places miles from wherever you are, so you’ll be doing the exact same thing the guest would be doing–searching Google, Yelp, Trip Advisor.