You'll get tons of different advice from tons of different people
The big question for you to decide is - compact (including Bridge) or system camera, and if a system camera, DSLR or DSLM.
It only makes sense to go for a DSLR or DSLM if you are willing to put in a bit of time and learn the basics of exposure, white balance etc., i.e. leave the auto modes. Only that way you will get great results. As for DSLR vs. DSLM - DSLM are smaller and usually lighter, thus well suited for outdoor activities. The ergonomics are however worse, and many still prefer a DSLR's optical viewfinder over a DSLM's electronic one (essentially just another screen).
Normally it wouldn't be too important whether you go Nikon, Canon, Pentax or whatever, but for outdoor activities I recommend a weather sealed model. Pentax is famous for building extremely rugged, weather sealed DSLRs that are as good as, if not better than those of the more well known brands (CaNikon). I use a Pentax K3 and when out in the highlands it doesn't go into my backpack when it rains - it just doesn't care. There is an infamous video of a US soldier in Afghanistan first heaping sand from sandbags over his Pentax DSLR, then rinsing the stuff off in the shower
The Pentax K50 or its successor, which is about to be released shortly, are both cameras that are roughly on the same level as the Nikon D5300 and Canon 700D, but they offer more for the price, most importantly weather sealing, a larger and brighter viewfinder and a second control wheel (something you will love once you get into manual settings).
If you'd prefer a smaller package, among the DSLMs the Olympus OMD EM1 or its cheaper (but still very good) predecessor, the EM5, are both rugged, weather sealed and highly regarded.