Time Between Ceremony and Reception

I really don’t want there to be a ton of time in between the ceremony and reception as guests won’t have anything to do. We are getting married in a tourist town so there are some places they could go to in between. But my concern is I’m not giving myself enough time for pictures in between. We are going to do some bridesmaids and groomsmen pictures before the wedding (just not together) to save time, but we want to go to a few outdoor spots downtown to get some pictures as well. Our wedding is at 3:00pm and is a short 30 minute service. We will do some quick family portrait pictures at the church before getting on a party bus to take us downtown for more pictures. We don’t have to be at the reception until 6:00pm which is right in town, and guests have cocktail hour beginning at 5:00pm. Is this going to be enough time? Thanks!