Struggling with Checkboxes + Text Search PHP/SQL

I'd like to have a search and textbox filter for my site. The search would search for the name of a place and location while the checkbox would filter a activity. Right now I have a working search and a working checkbox filter but can not figure out how to combine them. I'd really appreciate any help or links to tutorials etc as I'm still learning both languages and only recently started struggling and am now at a complete standstill.

Here's the PHP

<?php
  if(isset($_POST['submit'])){
  if(isset($_GET['go'])){
  if(preg_match("/^[  a-zA-Z]+/", $_POST['name'])){
  $name=$_POST['name'];
  //connect  to the database
  $db=mysql_connect  ("dbhost", "dbo560757688",  "pw") or die ('I cannot connect to the database  because: ' . mysql_error());
  //-select  the database to use
  $mydb=mysql_select_db("db560757688");
  // Fruits
  $fruits = array();
foreach($_POST['fruit'] as $fruit) {
    $fruit = mysql_real_escape_string($fruit);
    $fruits[] = "'{$fruit}'"; 

    //-query  the database table
  $sql="SELECT  ID, FirstName, LastName, Email FROM Contacts WHERE FirstName LIKE '%" . $name .  "%' OR LastName LIKE '%" . $name ."%' WHERE Activity LIKE (" . implode(", ", $fruits) . "";
  //-run  the query against the mysql query function
  $result=mysql_query($sql);
  // Table Poop
  echo "<table border=1>
  <tr>
  <th>Name
  </th>
  <th>
  Last Name
  </th>
  <th>
  Activity 
  </th>";
  //-create  while loop and loop through result set
          while($row=mysql_fetch_array($result)){
          $FirstName=$row['FirstName'];
          $LastName=$row['LastName'];
          $Activity=$row['Activity'];
          $Email=$row['Email'];
          //-display the result of the array
    echo "<tr>";
    echo "<td>".$FirstName."</td>";
    echo "<td>".$LastName."</td>";
    echo "<td>".$Activity."</td>";
    echo "</tr>";
  }
  }
  }
  else
  echo  "<p>Please enter a search query</p>";
  }
  }
?>