There are some very interesting concept ideas here. Personally I think the seafront area would greatly benefit from some greenery and as these photos of Southend and Great Yarmouth show, non-native species can be very attractive.
In fact, it could be argued that visitors to Margate would prefer to see exotic species rather than the usual sycamore, ash and plane trees which can be seen at their local parks or woodland anywhere in the UK.
After all, there used to be lions and tigers at Dreamland, and they are not native species.