Climbing roses are perfect climbing up posts and then spreading along a porch roof or trellis. Make sure you get salt tolerant hearty stock. The only negative aspect to climbing roses is that they must be deadheaded on a fairly regular basis as soon as the blooms fade. This can be a real job if the roses have grown above a level you can reach. But this one chore should not deter you.
Roses are usually quite disease resistant.
For a splendid effect, combine a few colors and varieties. Annual vines are fun and whimsical. I usually order morning glories, nasturtiums and black-eyed Susan vines from gardening catalogues during the winter. Nasturtiums and morning glories are usually placed up on a table or wall so they will be a mid-summer delight of trailing flowers easily visible to anyone who visits. I literally plant, water occasionally and ignore.