Hmm, now I'm thinking about how I would plan a trip like that... Google Maps shows 139 miles from Portland to Mt. Rainier. My Model 3 (long-range, RWD) has about 306 miles range at the moment (after 42,000 miles) so I could almost go there and back without charging, but altitude changes and low temperatures will crimp the range a bit.

Are you familiar with Alexander's Lodge? (https://alexanderslodge.com/) It looks like they have a couple of Tesla Destination Chargers, which typically work at around 40mph, (40 miles of range for each hour of charge) so it would work to drive there, charge for an hour or two, and have enough range to comfortably drive back to Portland in a day or two.

Of course, that doesn't mean the Model 3 is right for you in every way, but it's interesting to think through scenarios like this.

(edit) https://www.plugshare.com/location/79838