going on first surf trip

[robert00]

hello
ive been surfing regularly for almost 2 years (venezuela - small wave country) and im heading with a few friends for my first ever surf trip. were going to the tamarindo area in costa rica, and nicaragua (colorado and panga drops). can you give me any advice in how to endure physically 2 weeks of surfing every day (he most ive surfed is 3 times a week, very rare), i surf mostly 1 time a week (5 hour sessions in general), but im in good physical shape, i can endure up to 5-6 hours in a one session day.
i would like to know
session lenghts? (so i can do 2 sessions a day)
how much sessions per day?
how to avoid rashing?
good beaches in this areas?
what to eat?
everything you guys can help me with, and your advice
ive done surf trips here in Venezuela, but nothing compare to this lenght and quality of waves

please help me out
thank you very much and cheers from Venezuela