I had to dry my stuff twice too. I did two loads at a time and when it didn't dry the first time around I just loaded everything into one drier to save the $1. As the other poster said don't try to run large loads.
I buy detergent right there in the laundry room but, bring a few fabric softener sheets, they make the suitcase smell nice. I brought $10 in quarters for a one week stay and ended up needing a bit more change can't remember if there is a change machine or if I went to the front desk. But, I did several loads of laundry as my youngest son threw up on his security blanket...twice.
We like to pack light and do laundry there because, we just don't have enough clothes to wear two sets a day for 8 days, not to mention all the lugging and having a mountain of dirty laundry when you get home. We tour during the day then come back to the resort and clean up/relax before going out for dinner. We usually do one light load and one dark load on about day three then one more load of just odds and ends on day 5 or 6. This just barely gets us through. Do look at your watch so you are there right on time to get the stuff in the drier or to avoid wrinkling of clothes just sitting there. If we are not at the pool during laundry time, I ususally take it down, then DH throws it in the drier then I come back and fold it and take it back up to the room.