I like to keep it sober during the day to avoid ruts like yours. Weed can def. breed sedintary behavior, so I like to try doing new constructive things when I smoke it to counteract that. Lately I've been learning slide guitar and am having a blast (being high is the best way to learn this, as I sound awful, but weed makes the noise bearable). I also do alot of nature photography when high, there's something special about being out in nature when you're high, almost a religious experience every time. Kayaking is one of my fav. things ever to do, but its a bit cold yet. Another great thing to do is pick a fancy desert or meal to make, I find when I'm high I have an uncanny ability to add the perfect amount of spices and whatnot to dishes and its great way to pass the time with a little reward at the end (though the kitchen is usually a disaster area when I'm done cooking high). Another one of my fav things to do is go to my hippie buddies house to blaze, because he doesn't have a TV, we just hang out, talk about all kinds of crazy stuff, and just have fun. Its amazing the places you'll go in conversation, ect. without a TV around.
Weed puts us in touch with whatever we are doing, so I always try do be doing things good for the mind, body and soul.
Ha, I apologize for my hippiness in advance, hope ya find soemthin to do man!