Indeed, in Maine you get "way out where the good rafting and all the moose are" or "hotels where there is cell phone and a/c". (I guess moose don't need cell phones, after all!)
Take a look at the
Bethel area. It's on the outskirts of civilization (that may be debatable

) There is a major ski area though= good number of hotels, restaurants, etc. I can vouch there is AT&T cell service there, but I'm fairly confident saying most probably do (in town anyway) because of the ski area. The hotels I looked at did have a/c as well.

Crap shoot whether you need it- that area is likely to be cooler as it's in the mountains, but it can get warm. (I'm defining warm as 90 degrees.) FYI you're looking at independent hotels, I can't think of any chains in the area. Tripadvisor.com would be good to get a feel for how each is. (I have spent alot of time there, but my grandmother lives there so I've never needed a hotel.)
There would be places to fish in the area. It's on the Appalachian Trail, lots of good hiking. The ski resort (Sunday River) has mountain biking and ziplining, probably other stuff too, if those are of any interest.
I have seen moose there- but as others have said, I'm a native Mainer and have seen moose exactly three times in the wild. Once was in Bethel, once next town over. (Third was in NH, about 45 minutes from there.) I agree with the person who said take a moose tour. The one I saw quick on the Bethel site is probably an hour away from Bethel. Well worth it though if that is on your must-see list. (Otherwise, you can see moose and other Maine animals at the Wildlife Park in Gray, lol.)
Rafting- that also would be an hour, hour and a half from there. The Forks (that is the name of a town, believe it or not) is "the" place to go. That is middle of nowhere though. (I drove through there this summer- I think we had spotty cell coverage, but nothing I'd depend on.) If you stayed there, you're primarily looking at renting a cabin, no internet- and there is very little by way of restaurants/stores around. I'd say make a day trip of it instead for rafting.
You'd also be an hour and a half or so from Portland for a day trip.
Acadia (no R

) is also beautiful. As others said, $$$ in the summer. It's a seaside resort town, with a National Park. You'd be in range of cell phones, internet (and probably a/c, though that would be something to ask if important to you), there. Alot of hotels to chose from, all ranges, though nothing "cheap" for sure. Plenty of shopping, restaurants, "civilization". You've got hiking there, biking is big (John D Rockefeller gave money for a series of carriage trails that are now primarily used for biking.) You could kayak (sea kayak, or there are some ponds in Acadia too).
You ~might~ see moose there (shoot, there have been moose sightings in Portland before), but that is really not the area I'd consider it likely. Also no where near anywhere for rafting.
FYI, time wise- mapquest says 2h40m to Bethel from Manchester and 4h 50min to Acadia from Manchester.