Most of these activities all take place out in Mae Rim and you would take transport there, either by red truck or through the operator, therefor where you stay is not so important when it comes to getting to those activities.
Driving around I see some Halal food signs, but as I have no vested interest I have never specifically sought it out.
I would make your hotel decision based on other options, perhaps even using the proximity of halal food as a option, I am sure there are others who can chime in where to find it easily. Out in Hang Dong there is not much to do for non Thai speakers and I am willing to bet that you will not find Halal food out there.
My assumption would be that closer to Night Bazar/ Chang Klang road you will find such restaurants, be close to the city and things to do, while being a 20minute ride away from all those adventure activities.