New Yorkers seeking another summery cocktail boîte can make a beeline to Mother of Pearl, in the former Gin Palace space on Avenue A. It’s a Polynesian escape in the heart of the East Village, complete with palm-tree decor and totem pole-like bar stools. Consider it a nouveau tiki bar for those who can’t island hop on the fly, and a watering hole for those whose tastes veer to the fruity and fun. Just check out these sample libations: Imperial Bulldog (raspberry, pineapple, lime, cachaça, aquavit and Underberg), Sinking Spell (yellow chartreuse, star anise, rum and orange bitters), Mexican Summer (watermelon, paprika, wheatgrass, tequila and lime)…