One of the activities that you can do when you travel to Davao City is to have an overnight stay in Eden Nature Park & Resort. It will be a different experience for you since it doesn't involve the beach which is usually the case when you plan vacations in the Philippines. It has that outdoorsy-type of vibe which doesn't have that roughing it out aspect. They have air-conditioned cottages and hotel rooms that you can rent.
We had a lot of fun when we had our stay there and we would like to come back for another visit when w're in Davao.