Interesting I have just purchased a 2597LMt myself.
So had a look around for you.
You may have to enable the map layer containing those POI's or save them as favorites (the later sounds like a lot of work if there are lots of POI's you wish to display).
I temporarily set my home location as a favorite & it displays automatically on the map so that works.
You may have to play around with the map layers settings.
Found the following quote; may help. Source; http://iqc.garmin.com/eCustomer/KODSelfService/request.do?create=kb:garmin&view%28%29=c{f5530d80-b556-11df-55a0-000000000000}
"Question: Will my automotive device display POI icons on the map? Answer: Most automotive devices will only display icons on the map for your saved Favorites or custom Points of Interest (POI) files that you may have installed. To view the custom POI icons, you will need to zoom in the map to 200 feet or closer. The preloaded points of interest (restaurants, hotels, attractions, etc.) will not display icons on the map if they are not also saved favorites.
The device will show the POI icons on the map when it has started moving or is in an active route.
POI icons will NOT display on the map if your map view is set to either North Up or Track Up.
The zumo 350, dezl 760, RV 760, and nuvi 2405, 2407, 2408, 2505, 2507, 2508, 2707, 2708, 3400, 3500, 3507, and 3508 series devices will only display POI icons when you have that map layer selected. For more information on map layers, view the article
Also here is the manual if you don't already have it downloaded.
In the mean time I'll have a play around with my Nuvi to see what works for custom POI display & map layers. My old 1490 doesn't have map layers that I know of, so have have never had the opportunity to learn this.
There is always something new to learn.
Hope that helps.
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