You can retire to the time and place of your choosing with a pension plan to boot.
1. to the time and place of your choosing with a pension plan to boot,介词 to 表示“根据”,意思是:可以根据你选择的时间和地点退休。
2. with a pension plan to boot,是介词短语修饰 choosing, 作方式状语。就是说,你在选择退休时间和地点时,带着的启动养老金的那个计划。