You may want to head over the Paraiso forum and look over the top questions tripadvisor.com/ShowForum-g663501-i11489-Pla…
The Maya has a few pluses over the Lindo but whether its worth more depends of whether you'd make use of the features: the Maya has elevators in each building, slightly larger rooms, 2 exclusive restaurants (a Japanese and gourmet however Lindo guests have their own gourmet and access to a Japanese), access to the wet areas of the spa and maybe a few others.
The wave pool runs once an hour for about 15 minutes and older kids will probably just prefer the ocean. There are lots of activities between the 4 resorts (staying at either will also give you access to the Del Mar and Beach ) for boys. The 18 year old will have access to the adult disco but the other won't.