5 days - Bukittinggi, Padang, advice needed

I have never been in S.E.A. I am living in Seoul. Recently I was
invited into an event in Singapore from 24~27 April. So I have a plan
to travel in Bukittinggi Sumatra for 5 days after the event. I will be
back to Seoul with 2 May 9:30 a.m. flight from Singapore.

After search with lonely-planet-book and something, I figured out an
itinerary. I am alone.

SIN(27 April) - Padang - Bukittinggi - Padang - SIN(2 May 9:30 a.m.
flight)

From 27 April I am free from the event. I can use the hotel room free
even that night, but there is no reason not to leave Singapore if I
have a flight to Sumatra.

I guess if only I get to Padang I have no problem to go to Bukit with
bus or something. Medan might be an option, but then Bukit is too far
from there. And I heard Padang-Bukit route is beautiful. I will visit
some lakes like Singkarak and Maninjau in the mean time.

Is the plan reasonable, or better option? FYI, I like sea. Even
mediocre scenary of sea will attact me. If I have an opportunity of
fishing I may give up all and may stay there all the time. So to speak
I have no fixed travel plan^^.

Is there anyone who makes my 5 days of first S.E.A travel funniest?

Thanks for your reading.

p.s. Earlier I was privately helped by Peter Loud. Repeating again my
thanks here.