In medium pan, stir together gelatin and sugar. Stir in pineapple juice, lemon juice and almond extract. Cook and stir over low heat till the gelatin dissolves. Chill in refrigerator for about 1 hour or until cool. Stir in half and half. Chill till partially set (the consistency of unbeaten egg whites). In a mixing bowl, beat cream till soft peaks form. fold into gelatin mixture. Pour into a 5-6 cup mold. Chill till set. Unmold and garnish.