i think i would only fly from a speed 400 and down. i wouldnt fly gas anywhere where im not in between farm feilds. planes like the lite stick and tiger moth are great for use in parks. also if the park is big enough, they can accomodate speed 400 models like the zagi. the park i fly from is big enough to fly seaplanes from so gas is fine there but IMO it all depends on the size of the park.
Jeff