Hi, that's the way for going to Pont Aeri from Lloret, u have to take a bus to blanes (as lloret doesn't have a train station), and from blanes go by train to maçanet-massanes, followed by another train to sant celoni. It looks kinda complicated, but it's not so difficult and it's not so much time.
Bus from Lloret to Blanes:
The company is Autocares Pujol, here is the site of the line:
http://www.transpujol.com/documents/es/06/busli_2.html , it's bus number 6, u get it at lloret bus station (wherever it is), and go until the train station at blanes, the times you have them in the pdf that says "Horarios de esta línea en PDF".
After you have to get the trains I mentioned, this is easy, just ask, the times and the site are the following:
departure arrival departure arrival
from maçanet maçanet sant
blanes celoni
R1 07.16 07.29 07.46 08.04 R2 0.48
R1 09.15 09.28 09.57 10.15 R2 1.00
R1 11.16 11.29 11.57 12.15 R2 0.59
R1 13.16 13.29 13.57 14.15 R2 0.59
R1 15.15 15.28 15.57 16.15 R2 1.00
R1 16.15 16.28 17.27 17.45 R2 1.30
R1 18.15 18.28 19.01 19.19 R2 1.04
R1 19.15 19.28 20.27 20.45 R2 1.30
R1 21.12 21.27 21.52 22.09 R2 0.57
The site for whatever problem is:
http://www.renfe.com/viajeros/cercanias/barcelona/index.html , there you choose the departure and arrival station, the date, and it tells you the times, but I looked them for you to make it easier.
As you can see it may take approx 1h30min the complete trip, it's not so much...
Hope this helps you! Any problem, send me a private message!