I would definitely choose the second idea. Its complexity,
compared to the first one on selling hot-dogs, is definitely more
alluring to your targeted sponsors - the venture capitalists.
In your proposal, you may wish to mention that ASEAN is working
towards a liberalisation of air space in Southeast Asia, and that
freeing up the skies in our region will certainly give tourism a
boost. Competition will eventually bring air-fares down, giving the
elderly - even those who are not exactly well off - an opportunity
to enjoy the delight of leisure travelling. For a start, the
Singapore-Kuala Lumpur air route will be opened to budget airlines
like Tiger Airways from 01 Feb 08. Capitalising on this forthcoming
development can be particularly lucrative. 
Besides, the government is going to give social enterprises a
much-needed lift, after recommendations have been finalised.
Depending on how you angle your strategies, your business may be
able to take advantage of this. 
By the way, is SWOT = Strengths-Weaknesses-Opportunities-Threats
Analysis? 
