37.2X Optical Zoom
37.2X Optical Zoom of Nikon L840 will give you a lot of flexibility considering this will be your only camera during the day.
Medium size Body
With relatively smaller body compared to DSLRs and better ergonomics compared to Compacts,Nikon L840is a good compromise between size and functionality.
Carrying this weight all day may not be very comfortable for you. Body Thickness 96mm
With a thickness of 96mm,Nikon L840 is not a pocketable camera for sure. Small 1/2.3" (6.17 x 4.55 mm) sensor
Nikon L840's small sensor struggles in low light situations compared to larger sensor. No RAW shooting capability
RAW files contains much more color information compared to JPEGs, and gives you more room for post processing without significant quality loss. They provide wider dynamic range and option to recover shadow and highlight clipping to some degree.