I'm a little passed the amateur stage of photography and I'm looking to upgrade my Nikon D3100 my problem- I like Canon options, prices?

But I already have Nikon lenses Etc. Should I make the switch or stick to Nikon

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Is it ok to leave a professional camera in a hot car?

The reason I'm asking is because I have plans to go out with my friends next month and I wanna bring my Nikon. We're going out to lunch and getting our nails done then afterwards we'll have a photoshoot. In May it usually starts to get hot so I was wondering its ok to leave it in the car for a few hours since I don't wanna bring it into the restaurant or nail salon. (I'll hide it of course so it won't be visible from the outside). Leaving it at home and going back to get it isn't an option since we won't be in the area

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