Lenovo X1C is the standard-bearer for a Linux notebook experience that is hassle-free, hardware-wise, and includes a great keyboard, trackpad, screen, battery, all in a slim ultrabook format. I wrote up my experience of a 4th gen model here:
https://amontalenti.com/2017/09/01/lenovo-linux
If you care about outdoor usage, opt for the matte IPS screen rather than the glossy options. Lenovo sells both types on almost every model. I'd also suggest skipping the touchscreen.