Myrtle Beach is an older town with rather touristy areas. The independent hotel that our team stayed at cannot be recommended - well, well past its prime and not what we would have chosen on our own. Still, the ball fields are great - soak up the experience at the fields. You may be better off sticking to established chain hotels or even getting a room off the beaten path. It sounded like the hotels and restaurants around the golf courses (further away) were nicer. The boys won't care - they will enjoy the games and the time together.
The best game times are the evenings, when it is cool. During the day, even the early morning games can get very warm. The upside was that the players were provided with beverages in the dugouts. Spectators should come prepared.
Plan to spend some time by the ocean - the views are spectacular.