Which job should i take?

since December of 2008, i have been working at a gym, 3 days a week, 5 hours each day, at $8.00. It is an ok job but i feel like im better than checking people in all day. However, I have the opportunity to work for the company my dad is a general manager for...whom ive worked w occasionally since 2002. I would be working at a minor league baseball stadium, running several food stands, and making a daily rate of $110, and we would be working 20 days out of the month, however it ends in september and i would have to find another job or try to get another venue w this other company. Should i stay at the gym....or take the baseball park? And theres no way of working both jobs bc the schedules coincide...i already tried figuring out how it could work....