you'll do fine! just organize and plan activities ahead of time! that way he won't have time to get "bored" and wind up into mischif...look into local childrens museumes in your area (many of them have free admission), also, many art museums and botanical gardens have free admission on certain days- kids LOVE colors!! Maybe after a trip to one of those you could take him back home and let him color what he saw! ....visit your local animal shelter and pet the kitties or walk the dogs, take him to dollar tree and give him his own "dollar" to spend on anything he wants - teach him how to be responsible for his "money", take him for a walk in the park or to your local playground, set up "coloring time"- and his own special area that only he can color in...so he's not tempted to color on...oh say, your walls
....I suggest (crayola colorwonder paper and color wonder markers- they rock! the only thing the markers will show color on is the special paper- so he can't color on anything else
), also, set up a "movie night"...maybe rent a movie or two that he likes, pop popcorn, ....and camp out in the living room and watch a movie with him, also- playdough and bubbles always work!!! Maybe you could come up with some fun arts & crafts activities for both of you do. I would try to plan your weekend as best as you can so that he doesn't have time to get "bored"...and so that you can enjoy your time together without trying to figure out what to do next. Good luck!