I am also very frustrated that Jetblue got rid of this flight. It was affordable, convenient and comfortable.
I ended up in Cabarete last time and it was also a lot of fun. The thing I missed most about LT were the quads but I found I didn't really NEED one in Cabarete but things would have been more fun with one. Even though the quads were not so prevalent, I found a car rental place in town in case I really needed one but I didn't want to spend the $ in the end.
If your goal is beach, chicas and decent food, Cabarete is a fun alternative and very close to POP airport. I prefer LT too but will not sit in a Dominican cab or bus for hours to get there.