I babysat for almost 5 to 6 years and I babysat for girls and boys of all ages. The best thing to do with boys is play plenty of active games. I used to try follow the leader, hide and seek (if they aren't too young!) ((3 or 4 might be too young)), safe game of pillow fight, backyard running around, or cars. Boys do like to be active and this one 4 year old I babysat for was so easy. He had a 2 year old sister who was easy also! We would go smoothly from one game to the next. Try to make everything a learning experience. I used to ask periodically, " RAISE YOUR HAND IF YOU LIKE _-----" and they would raise their hand or whatever. No matter if it was food, an activity, or a certain item. Or since it's just little kids break into a fun song of Hokey-Pokey ?? If they don't do it with you at least it will give them a good laugh ( and some entertainment) The next few times you can Teach THEM how to do it. Also see who can bounce in one place the longest? If you are tired after all the activity try popping in an education video and ask them questions afterwards. If the kids learn something while you are there the parents will appreciate your time a whole lot more! (trust me!)
I have baby sat for over 20 different family's without ANY advertising, it just went through word of mouth!